There is a video on youtube of a guy that somehow was able to hack a PS4 and he was running Bloodborne at 720p at 60fps on a ps4 with eventual drops to 45-50. And it looks so much better, I just dont get why developers do not give us the option of doing it with the games. SO yeah it's definitely possible to unlock the framerate if they want.
He hacked a game that was hard coded to run at 30fps to run at 60fps.
So you're looking at a patch to be required to get that running at that frame rate on PS5. It's not going to get a higher frame rate because the games coding doesn't allow it.
This is what I have been saying. If a game is capable of higher frame rates and resolution then those will improve. But if the game is locked at a specific specs, then the improvements will be far less pronounced.