I’m not sure the UI/UX is anyhow related to kernel development.
I3/Sway/Hyprland/other WMs are already much more superior to anything that can be achieved in Win/Mac desktops in terms of flow and performance. Only polishing is needed. Other desktop options like Gnome/KDE are fine and more lightweight desktops are okay too. They need polishing too, but already great.
The huge amount of grind is what made it un-fun for me.