I’ve never had a display refresh rate higher than 144, but maybe because I play games but I can definitely tell the difference between 30/60 and even 60/120. After 120 the difference between 120/144 starts to diminish but there’s still a slight difference though it’s more pronounced in very fast moving objects like moving a mouse.
Of course they can. If you ever try to go back, it looks like garbage. There is no limit to improving the illusion of smooth motion, but it scales non-linearly (you need to double the frame rate each time to improve it noticeably). I can't personally tell apart whether it is running at 144 or 120 fps, but the larger jumps are very obvious.
Yea 120 v 144 isn’t too big of a difference for me. Actually until I got a new GPU that could actually output 120fps at 1440p, I left my monitor on 120hz. When AMDs AFMF drivers came out I actually went ahead and bumped the refresh to 144hz as I was definitely starting to see screen tearing but it was still pretty fluid. I’d be curious on whether the next jump for meto will be 4k 144hz or 1440p 240hz
Absolutely they can, though I found anything above 240hz to be indistingushable for myself personally. Though the monitor I'm writing this on is 300hz; it's motion clarity is only bested by OLEDs and the $2000 AUD (twice what I paid for this) 360hz bigger brother PG27AQN.