I just did a fresh install of windows 11 last week, after my attempt to switch to Plasma on Debian Fedora did not go very well. While it's absolutely true that some de-bloating must be done right after install, it took me like 15 minutes. I spent at least that long just finding the three different goddamn places I had to go to change the wallpaper in Plasma.
The problem is you used Debian which is missing bug fixes for KDE, and is on a frankly ancient 5.27 - I have had nothing but an awesome experience on KDE 6, with both VRR, and HDR, working under Wayland.
Whoops, I was actually using Fedora. I had to go check the kde website, as that is where I got it from and thought it would be weird if they recommended something so out of date.