Yeah, 60Hz looks like a slideshow after using 144Hz for a while.
It does get rapidly better after 60, though. I think I can stop telling a difference at around 80. So there is some hope that we can have 4k@better-than-60 in the near future.
Using text, I am fine with 5fps if it is not blinking like a CRT did. My kindle I think does 0fps when not changing pages and it is 100x better than a monitor. I have found the 300fps thing a bit silly for computers meant for text (which is my use case, not claiming it is the ONLY use case).
It does get rapidly better after 60, though. I think I can stop telling a difference at around 80. So there is some hope that we can have 4k@better-than-60 in the near future.