That's fanboy babble. There are people that prefer to game on a console and ones that prefer to game on a PC. They're separate.
If you prefer to game on a PC and own a console chances are it's for probably for access to exclusive games and outside of that you aren't meaningfully contributing value to their ecosystem revenue because you game on a PC when you can. If you're gaming on a PC and don't already own a PlayStation you aren't interested in buying one. You ain't gonna play a 2 year old late game that was praised and critically acclaimed years ago when it was released then change your mind.
You're saying the exact same thing I'm saying.
Sony gets to release on PS5, soak up sales and acclaim (assuming the game is good), and then introduce the game to a different playerbase with the momentum gained from the original release. Seems to be working for them, just like Microsoft's plan appears to be working for them too. When your ultimate goal is to get people into the GamePass ecosystem where they won't need to pay for the games anyway, there isn't really a point in staggering releases, unless they just aren't ready.