I don't think anybody ever sold nixos that good to me before.

I might try it again. Last time I really did not like that any minute config change would take 15s to apply.

But the biggest issue for me, is that right now I have a good enough solution, that allows for config file update from applications. I have a small git repo, with one shell script, that symlinks config files, and even generates a few. And so backing up the latest config changes from KDE, freecad, etc, is a git add & commit away. I have another shell script to setup the base Ubuntu the way I want. And my data is replicated via syncthing.