When I got the XSX recently, it was so I can play Starfield when it comes out. That was basically the only reason. I did not realize the extensive backwards compatibility that this thing has. But since getting it, I've been playing FF13 trilogy, Fable games, Dragon Age series, Lost Odyssey, etc. Basically all games of note going all the way back to the OG Xbox will play on the latest console. Either with the original disc, or you can even purchase them online.
The point of my post is I think it's a real travesty that PlayStation doesn't do this. I don't understand it. First of all, you cannot buy most PS1-PS3 games on the digital store. You can't use the discs. The main way to get access to these games is through the top tier of PS+. But the selection is quite limited, and PS3 games in particular are streaming only.
With the selection, I want to point out that you can't even play most of the Killzone series on PS+. This is a first party title. There is absolutely no reason that Killzone shouldn't be available. Killzone 1 isn't even on there. A PS2 title that is not graphically demanding.
As for the streaming of PS3 games, maybe this was justifiable back on the PS4 because the PS3 has a unique architecture that can be difficult to emulate without performance drops. But with the capabilities of the PS5, it's not credible to claim that it can't emulate a PS3. It certainly could, if Sony wanted to assign resources to make an emulator.
I am not a fanboy of one or the other, and I probably still play more on the PS5 than my Xbox, but I think Microsoft should market their backwards compatibility superiority a lot more than they currently do.
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.
No it hasn't - the 360 was PowerPC based just like Wii, WiiU and a lot of the PS3.
MS just had a lot of PC experience and games to fall back on.
Whoops, should have look it up I guess. Sorry for my old and fading memory and thanks for correction.