I'm Canadian but I always write using the USD $ to make it more understandable ... tired of going to price converter with your €, If you going to respond shouldn't you used the same currency rate? (2TB SSD at 230€=268.33$USD)

Microsoft and Sony were never going to go with a 2TB SSD, the biggest buying factor at retail is always price so adding an extra $100 would of really hurt their console sales. 

1TB Expandable SSD at $220 on Xbox series X just doesn't make sense when considering an XSS is only $299. I'm saying you should either clean up your drive or get HHD expansion until the price drop on the Expandable storage. I have been moving games on my Xbox One X between external and internal it's pain-free and doesn't take that much time. So, really nothing compared to the option of adding a 2TB HHD at 60$USD. 

$220 is 44% of the cost of Xbox Series X. I guess we all heard the price was going to be $220 so not really a surprise, but still, I think Microsoft really drop the ball on this one. 

So what you are saying is you don't actually need that much space. Dowloading games is fast enough to start the download before you want to play it.

500GB will be plenty for anyone. Any more is luxury, not necessity.

I don’t see the problem. I just delete games I beat and install ones I will ply next. I might even use Xcloud to play certain games so they don’t take up hard drive space.

Thats absurd. I expect some backlash soon. 

I will be buying 1 for each game I purchase, and I will make custom game cases for each of them to treat them as game cartridges. I can't decide if I'm going with gold or platinum for my custom casing.

Baller! I say go with Platinum.

Might be a luxury to you and others in developed countries. But where Im from it will take me a full day to dwnload a game or hours patches. I live in the US now but I still think of that inconvinience. You just cant inmagine how much a little inconvinience or small added confort can be a deal braker for a lot of people. 

Which "normal SSDs" can be added to the PS5 where games can run from?

We still need a compatibility list!

https://www.pushsquare.com/guides/which-ssd-drives-will-be-compatible-with-ps5

Pushsquare's guess is that only the 980 Pro will meet the needed specs:

https://www.pushsquare.com/news/2020/09/this_could_be_the_first_ps5_compatible_ssd

I think pushsquare are looking at the 7.5GB/s figure for PS5 SSD... which is why they think 980 Pro is needed, forgetting that the 7.5GB/s is compressed speed. PS5's ssd actual speed is 4.5GB/s (presumably read, or maybe both read/write) which several SSD's on the market can match.

We definitley need that compatibility list, however I imagine this is more of a "this will definitley work" list, and that SSD's not on the list will also work assuming they can provide good enough performance.

As a rule of thumb, price in Euro is roughly the price in US$, just with the difference that the Euro price has it's VAT already included.

And I agree, SSDs weren't cheap enough yet to go 2 TB at the launch of this gen without being a substantial part of the unit price, and that's also the reason why the Series S has even just 500 GB. But that doesn't mean that storage extensions should be way more expensive than with off-the-shelf SSDs.

With one exception, all of the PCIe 4.0 SSDs seem to have both read/write over 4 GB/s (the one who doesn't is the 500 GB version of the Corsair Force MP, which only reaches 2.5 GB/s in writing, but still 4.9 GB/s reading), so they all should do the trick. At the same time, PCie 3 SSDs reach 3.8 GB/s read maximum (writing generally below 3 GBs), so they're all too slow.

In other words, I'm pretty confident that all PCIe 4 SSDs will do the trick, but everything that doesn't reach PCIe 4 (or newer later on) won't be enough.