If you’re on Linux, for Proton, and Steam Input for compatibility. There have been many games that won’t work with my PS5 controller unless I run them through Steam.
No. You can insert any PS4 or PS5 disc into any PS5 with a disc drive and it will run the game. It might also require a download, but they’re not tied to specific accounts.
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Protip, you can run pirated games through Steam as a non-Steam game as well!
Discs have become more of a tradeable license than anything else, but that’s still far, far better than having no option at all.
Probably, considering that even with the closing of the PS3 store 20 years later, you will still be able to download and patch games you’ve already purchased. PS4 and PS5 will likely be backwards compatible on PS6 (for digital games only, of course), so will remain up for even longer since they’ll still be usable on current hardware.
But even if they’re went the Nintendo route where you only have a 15 year window or so, a tradeable license during that period is better than none at all. Still sucks ultimately, of course.