sway and waybar's configuration management is better through HomeManager (again: unless I basically raw-configure everything). Not quite sure where in nixpkgs swayidle configs would go, based on the sway module.
Some other user-levels get tossed in there by virtue of "since HomeManager's there, I may as well use it".
It seems that most wiki pages that I see that have both NixOS and HomeManager sections at the very least make HomeManager seem more featureful or flexible.
