If my deck can't handle a game('s lack of optimization) I move to desktop. Or if it's a visual artsy game I play on desktop. The most egregious fsr glorpination in recent memory was water in horizon forbidden west. When I first saw the beaches I thought it looked like utter shit but when I switched to actual rendering it was suddenly one of the best video game beaches ever.

But yeah basically everything that moves looks like shit, and anything bigger than a steam deck display makes it easier to tell something is fucked. I'll check out fsr 4 but I don't have high expectations.