I'm sure there is a point of diminishing returns for display refresh rates, but I can tell you from experience that it is definitely higher than 60hz. 90hz feels meaningfully smoother (on a Steam deck), and 120/144hz (on a desktop monitor in my case) feels smoother than that. Even mouse input latency is perceptibly lower. I've never used a display faster than 144hz but I honestly would not be surprised to discover that one can still tell the difference well past 144hz.
60fps is basically fine as long as you are unaware that it can be any better, but once you find out you are forever spoiled by the knowledge.
60fps is basically fine as long as you are unaware that it can be any better, but once you find out you are forever spoiled by the knowledge.