Nailed it so hard that the girl came on the first try

The thing is, consoles need good exclusives to attract people who consider gaming on a PC a possibility, as all the other games are duplicated and the games are normally (yes, I'm looking at you, Arkham Knight!) running at a higher framerate with better graphics and a lower price per game on PC, especially if you don't need to buy the games at launch at wait for the sales. The exclusives of this generations' Xbox and Playstation however have been underwhelming, to say the least. Apart from Bloodborne on the PS4 and, to a minor degree, Sunset Overdrive on the Xbox ONE, most exclusives where either letdowns, remasters (and thus not truly exclusive) or just plain unremarkable. So yes, buying a 400€/$ console just to play one game is a luxury, as you're probably better off playing the other games on your PC.

Oh, and about PC gaming a luxury last gen, I really wonder. Everyone I know (with one exeption) who does console gaming also has a gaming PC and only plays the exclusive titles on the consoles. That was true for them last gen, and this gen most of them still haven't bought a console because it's still not considered worth it due to the lack of good exclusives.

Yup.  I would say it has education application, as well though. 

I missed the Gamecube era but still spent quite a bit on computer parts and PC games. By that, I would say console gaming (for me) is a luxury. Although it has sometimes felt like a necessity over the past 6 years that I've been back into consoles. I kept all my retro systems, and brought them out of storage quite recently! I've got no idea whether I will 'buy into' any future console generations, but the PC/Mac gaming will probably continue, just on a lower tone from today.

"Expensive" is case sensitive. Because you can afford to spend $400 on a console or even just a GPU doesn't mean half of the world can. 

To OP, like most have said gaming is a luxury. And is nothing like a smartphone. Dedicated PCs and consoled are in my opinion luxuries. Yes, you can do more with a PC, but unless your PC is a workstation I do not or cannot justify how anyone can spend upwards of $1000 on GPUs or components simply to push a couple extra pixels or frames. Yup, luxury. 

that's not a bad thing. Sex outside reprocreation is a luxury too :)

Gaming as a concept is probably essential to human socialization, along with a lot of other cultural phenomenon (music, art, drugs, religion, etc)

Console gaming is maybe not a necessity but it is not a bad activity.

8th gen consoles can be considered expensive, but gaming in and of itself isn't/doesn't have to be.  And expensive in 1st world countries is of course not the same as expensive a 3rd world country, so it's kinda weird to see people act like a luxury is the same thing in the whole world, and even weirder to see people think that everything that isn't essential for survival is a luxury, because that is not the definition of luxury.

My main point was that things that are nonessential aren't necessarily luxuries, because many people seem to have that misconception.

If a console isn't expensive to me, then it isn't luxury. Thus saying "gaming as a whole is a luxury" just isn't right.

so much missinformation in your post

- trophies are more valuable and have a status symbol than all the pc archievments you have counted, those are just pixels. Trophies are integrated into the OS and every game has to support them on playstation, they can also be unlocked offline because they are on the disc.

- most of these features you counted make the stuff more complicated. The OS on the ps4 is way more advanced than windows or mobile devices because its made for gaming in mind ( i can play the game while installing the game). The games get made for consoles and are less buggy than the PC versions, see batman.

- mobile and pc have exclusives but do they have uncharted 4 and bloodborne like exclusives? no

- why you have to say its a lincense? what does it matter? I can buy a disc put it in my console and play the game without any internet connection and even unlock trophies on my ps4. And there is no restriction on that. 

And i dont need DLC, the stuff comes out latter anyways on the disc on a remastered version

Consoles have always been a luxury for me. I've never cared to game on a pc, minus the old school Command & Conquer games, so i personally never considered pc gaming a luxury.

obviously anything you buy for entertainment or comfort is a 'luxury' by pure definition

in general I think its obvious that game consoles and handheld, despite generally being cheaper, are more luxuries than computers / PC gaming. I say this simply because a lot of people already HAVE TO own a computer for work or school so it's more logical to just upgrade it a bit for the entertainment factor- money will be spent on it regardless