Games are actually pretty well optimized nowadays. I mostly "game" on a 10 years old computer with a mid-range GPU I bought maybe 3 or 4 years ago and on a Steam Deck.

I sometimes have to disable graphical options but it's more the exception than the rule. On a lot of games, I can even play in 4K.

Of course as you can imagine, I don't game at 245 fps :D