And much better gaming specs such as VRR, near complete HDR capabilities, ...
Multi monitors are better supported, more customization (albeit it's harder to configure and get to the point you want sometimes).
It's not just color variants of the main interface 😇
I'm thinking about switching as well for those reasons but I'm disappointed on the NixOS support of KDE. Gnome is configurable through dconf at least for a kinda NixOS way.