There haven't even been PS5 games in the top 30, not in 2021. I have to wonder if these systems would still sell as well without backwards compatibility. It seems like the PS4 is still tracking ahead of PS5 sales and it was not backwards compatible. I don't think it had any notable games at launch either. Some people simply want to buy a new Playstation for no good reason.
Yea feel like people are just playing the PS4 select titles that are free with the console.