Xbox has always doing the x86 architecture(Edit: as corrected by following comment, 360 was not.) so it's much easier to do BC. For Sony or Nintendo it's just not worth the effort until the emu is mature that they can just reap the benefit. PS5 can already play almost entire PS4 library, Anything PS2 or before can be emu pretty consistently if you are trying to get it done, then it only left PS3 in a weird place. For PS3, many good games already have a PS4/PS5 remaster games, for non-best sellers you can probably get a cheap ps3 slim with enough storage to play those left out games.(ie, PSN only Puppeteer), OR stream them like you mentioned.
There are rumors of the Switch getting a successor next year. My biggest wish is for it to be compatible with the current games, included digital purchases. Honestly, if I can import my digital library and saves I’m already sold on a switch successor
This interview has some details about how it was done on Xbox: https://hanselminutes.com/632/eric-heutchy-on-backward-compatibility-xbox-one-x-enhanced-games-and-the-heutchy-method
Basically all games of note going all the way back to the OG Xbox
Gaming
From video gaming to card games and stuff in between, if it's gaming you can probably discuss it here!
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