High frame rates (low frame times, really) are essential to responsiveness which, for those who appreciate it, is going to make much more of a difference day to day than the odd hiccup opening a large file (not that zed does have that issue, I wouldn't know as I haven't tried opening something huge).
You probably do. Many people just never notice that. It's not about typing or reading fast either, it's just about how it feels. Typing into something with shitty latency feels like dragging my fingernails across a chalkboard.
It's the same with high dpi monitors. Some people (me included) are driven absolutely insane by the font rendering on low density monitors, and other people don't even notice a difference.
Honestly, consider yourself blessed. One less thing in the world to annoy you.
Yes, I can perceive that latency, if I am actively looking for it. No, it has absolutely no effect whatsoever on my ability to work. The latency is far, far below what could possibly affect neural feedback loops, even on the slowest editors. And it doesn’t bother me in the slightest.
Low-dpi font rendering also isn’t an issue for me, unless it is so bad as to be illegible (which no modern system is).