Agreed! I recently switched from a very custom Linux setup with a tiling window manager and all kinds of bells and whistles. The Plasma 6 release in combination with running NixOS which makes trying things out both easily and safely convinced me to give it a shot and I simply haven't left. It took some setup, of course, but Plasma is wonderfully configurable and has everything I wanted available with some tweaking.
Whereas GNOME and others required extensions, which are often out of date or somewhat sketchy -- before I could set things up how I like.
Exactly what happened to me too! Been using a Sway setup on NixOS for many many years, and I was just curious to try out Plasma 6. After a small config change, I had the desktop up and running, and I was impressed how it felt like. You can even use plasma-manager to store your KDE settings to a nix configuration, which make it easy to have a unified configuration across different computers.
Whereas GNOME and others required extensions, which are often out of date or somewhat sketchy -- before I could set things up how I like.
Big fan so far.