I never go back and play old games, they're rarely as good as I remember them. Plus I own the ones I like.
It falls massively short when compared to gamepass on xbox. New, non studio games are abundant on gamepass. You'd never see the likes of a Total War game on Sony's platform, for example.
But mostly, I already resent having to pay a subscription fee to play games I've already bought.
I'm currently on a purge of subscription services in general and there's nothing attractive to me in what they're selling.