Most don’t care. We forget that 99.9% have no idea what is going on with their phone, they just use it.
It is US that is not normal.
I have ProMotion on my iPad Pro and barely notice the difference, don’t miss it on the iPhone. Bad eyesight though. It’s subjective how much you notice it and whether you “can’t go back”. There is a lot of variance in human vision, one can’t really generalize from personal experience.60Hz is absolutely fine............as long as you've never seen ProMotion. General consensus is that it is 100% one of those 'you can't go back' things, like HD was 15 years ago.
I'm generalising from general experience, lol, I'm still on an iPhone Xone can’t really generalize from personal experience.