I dual boot Arch but mostly use Win11, cause KDE's implementation of HDR is even more fiddly and tedious. In 11, all I gotta do is enable the setting to use HDR, and it just works. I don't even have to calibrate my display cause my monitor has a setting to automatically process HDR content for me. All I gotta do is leave in-game calibrations at their default setting, and the monitor does the rest. Literally couldn't be easier. Win11 can even automatically convert SDR games to HDR (called "AutoHDR"), and my nVidia GPU can do the same for videos (streaming or local, unfortunately I can't find the setting in the Linux Nvidia drivers). And it just works effortlessly.

So yeah, that's why I still use Windows11. No other OS makes HDR so easy. (But TBF the monitor helps a lot too; LG C1, BTW.)