Comment by toast0
I think a PS6 needs to play PS5 games, or Sony will have a hard time selling them until the PS6 catalog is big; and they'll have a hard time getting 3rd party developers if they're going to have a hard time with console sales. I don't think you're going to play existing PS5 games on an ARM CPU unless it's an "amazing" core. Apple does pretty good at running x86 code on their CPUs, but they added special modes to make it work, and I don't know how timing sensitive PS5 games are --- when there's only a handful of hardware variants, you can easily end up with tricky timing requirements.
I mean, the PS4 didn't play PS3 games and that didn't hurt it any. Backwards compatibility is nice but it isn't the only factor.