So a powerful machine that will become outdated with no upgradability? Can't add any extra ram, can't overclock, can't sell your GPU to buy a newer GPU for a low price?

Seems like it doesn't have any the benefits of a PC that PC gamers choose PC for. 

Ok, some of you don't understand what a hardcore gamer is. A hardcore gamer will buy a console/PC to play the game he likes. Period. Why on earth should we care about anything else? So, please, could you stop with the "PC mustard race". If a console has games I want to play, I'll buy that console. If you don't understand why, well you are not a gamer, just a casual.

Sales is a tricky thing to quantify though.
A larger platform with more users is obviously going to have even moderately well reviewed games sell better than a console with less users with a highly reviewed game.
Xbox One is certainly a smaller platform than the Xbox 360.

How many copies has Gears of War 5 sold? And how many copies of Gears 3? Let's see if your math and assertions hold up to scrutiny.

In saying that... RARE has put out some solid titles, not industry leading like during the SNES/N64 days, but solid titles either way.

Kameo is probably very underrated, Nuts and Bolts was enjoyable, Viva Pinata was interestingly... Like Crack. I had to force myself to stop playing it.
Perfect Dark Zero had it's shortfalls, but was still a fun game.

Conker Live and Reloaded for the Original Xbox was absolutely amazing.

Killer Instinct was probably one of the most refreshing fighters in years, even if it was badly managed. (And only received input form RARE.)

And then we have Everwild, which looks absolutely gorgeous coming up, it was obviously inspired by Breath of the Wild and Avatar, which isn't a bad thing.

As for exclusives and creative freedom... I think you haven't been paying attention, Microsoft of today is not the same Microsoft from 10 years ago, I would wait and see what happens on the games front... Either way, we all have different tastes when it comes to games, some gamers will resonate with Microsofts titles, others with Sony's and the others with PC or Nintendo.

I don't think the Xbox One X has been the runaway sales success that Microsoft wanted anyway, it hasn't been a failure by any stretch, but it has certainly helped turn around the misconception that the Xbox One is an inferior platform from a hardware perspective which has probably helped their brand image.
I would consider X1X to have been successful in sales and not losing money, but it didn't really change the sales curve of Xbox or helped they reduce the rate PS4 was increasing the lead, but considering they were able to put better versions of the multiplats and people enjoyed the console I have nothing against it.

Pretty difficult to top Donkey Kong Country 1,2 and 3 and Killer Instinct on the SNES... And then beat Golden Eye, Perfect Dark, Donkey Kong and Conker on the Nintendo 64.

RARE's titles haven't been bad on the Xbox, if anything I think they are criminally underrated most of the time, but they certainly haven't been leading the industry. - In saying that, the industry is very different than the SNES/N64 era anyway, lots more competition.

350-400mm2~ tend to be the sweet spot for consoles.

The Xbox One launched with a 363mm2 chip, Xbox One X with a 359mm2 chip.

The Xbox 360 launched with multiple chips, CPU was 168mm2, GPU 182mm2, eDRAM 80mm2. - So it took allot of space when combined.

Well according to VGChartz Kinect Sports is their 3rd best selling game. While Kinect Sports 2 sold a couple million, which is still considerably better sales than most of their games.

It may not be a success, its also very polarizing, but Banjo N&B is fucking great. While Viva Pinata actually did well, had multiple releases and a TV show!

Its difficult to quantify since we don't get actual numbers, but it does appear Killer Instinct (2013) and Sea of Thieves did very well. KI had support for like four years and I found this link about Sea of Thieves. https://gamingbolt.com/sea-of-thieves-still-has-millions-of-players-says-rare-plans-to-continue-supporting-it

People have the impression MS acquired Rare and it was all failure. That's not really the case and its why they still exist.

Comparing previous gen to current with same CU is going to give lot more performance according to AMD. So tflops number can be misleading.  Lockhart if exist and is 4tf is going outperform the current X. If the new X is 12tf RDNA that is very powerful. Even PS5 9.2tf is big jump compared to the current gen console than the tf number suggest.

https://en.wikipedia.org/wiki/No_true_Scotsman

Ok, some of you don't understand what a hardcore gamer is. A hardcore gamer will buy a console/PC to play the game he likes. Period. Why on earth should we care about anything else? So, please, could you stop with the "PC mustard race". If a console has games I want to play, I'll buy that console. If you don't understand why, well you are not a gamer, just a casual.

I did loved Viva Piñata, and yes Banjo N&B was good enough. But Kinect Sports even selling a lot isn't memorable at all.

I don't think Rare is all failure but it doesn't have near the relevance it once had, unfortunately (and I don't blame MS for that, sure they have their share on it, but it is a combination of factors over more than one decade).

Still I said critical and commercial acclaim. KS sold good but it isn't critical acclaim nor memorable, VP I don't remember selling that great (but for all the fun it was I don't think people will remember it for decades after like DK and GoldenEye), Banjo I haven't seem people really happy over it (reason why the Yooka Laylee got hype, and didn't deliver).

But if you were considering this as success then sure they had, I won't compare metrics we both would use but will agree that yes they have kept alive and putting games up. I don't like what they did in SoT (was interested in the reveal, but that gone down fast), but I hope they can make a big hit in all aspects for their next game, they still have the potential I believe.

I expect lockhart to sell more than XSX, but not sure how much it will do against PS5 if it truly is a system 100 cheaper than PS5 but being 1080p vs 4k.

You've not answered the original question. You said games are why people buy the console.

All the games that the new Xbox has that a gamer would want to play would also be on PC. So why would a PC gamer buy an Xbox Series X?

Kinect Sports was locked behind an expensive accessory so the success of that game is even more surprising. I enjoyed Kinect Sports, I actually liked the concept of Kinect but I don't feel like games relying on expensive accessories really works out in the long run.

I didn't really feel critical success was important, especially when you consider some of their MS content has aged better than many of their older and more critically successful content. I never understood the hype critically acclaimed Rare games, not aging well is a reflection of these games always being flawed.

Killer Instinct (2013) would have reviewed well over time. The critics just looked at the launch version though which was more like a demo of content. Sea of Thieves was a critical failure, yet it was successful even at launch. So the opinions of critics aren't always crucial.

If Lockhart is 4TF and PS5 is 9TF, it shouldn't be 1080p vs 4K. It might be 1440p vs 4K. But nobody should expect every PS5 game to be 4K especially if graphics are being pushed forward and developers aim for 60 fps. Those would be the experiences I would expect Lockhart to do 1080p.

But I expect Lockhart to have 4K content as well, as PS4 Pro and X1 do.

You suggested Gears 3 sold 20 times better than Gears 4. But now you're saying at launch Gears 3 at sold 20 times better. In semi educated opinion, that all sounds like bullshit.

According to this site, which only has physical numbers. Gears 3 sold 6.22 million, while Gears 4 sold 3.38 million. When it comes to actual digital sales its very likely Gears 4 has an edge there given digital sales became more common on X1. So this Gears 3 selling 20 times more argument just sounds like bullshit. Also, Phil claimed Gears 5 sold better than Gears 4 which sounds strange, maybe he just meant launch numbers, but that's what he claimed.

Again, Bungie left to make a Halo clone with RPG elements. Meanwhile Rare had to evolve because the games that made them successful don't do well on Xbox. Some of Rare's greatest success has actually been with MS.

Sony's games haven't been that creative to be fair. Sony for the most part has just been interested in 3rd person story driven experiences. They're having more success now, but that doesn't mean they're being creative or diverse with genres or gameplay.

What I actually like about MS is their games actually do feel a little more diverse. Due to their content being more gameplay focused versus story driven, I spend more time with MS games. But to each their own. Also, MS has more studios now so I think you will see more unique projects coming from them. That includes the story driven experiences Sony fans seem to enjoy.

Currently I believe MS is gonna have the low end and high end console for the 9th gen. They're hyping a powerful console, but the masses want something more affordable that plays the same content.