On smartphones you interact with the UI in a more direct way, which probably makes the input latency even more obvious.

For me 120Hz is noticeable immediately when scrolling, though I also don’t find it important enough to warrant a higher price aside from gaming.

What I find more important is a high pixel density, though on phones that’s less of an issue as with PC screens - I have yet to find one comparable to the ones in current iMacs.