Ya bazzite is based on fedora with an immutable file system, so it’s called fedora atomic. Fedora atomic then has variants like bazzite, universal blue etc.

I’m curious if the baseline fedora desktop would have the same issues.

https://fedoraproject.org/spins/kde/download

Multi refresh rate on monitors is a relatively new thing for Linux so bugs are still being ironed out. It sucks that things like these are still not at parity with windows but it’s improving.