I've got an /etc/nixos that I'm pretty happy with. All my machines get a very similar env. Love it
Discussion
Do you have a CI/CD pipeline targeting all the systems with a base config and target-specific host configs? That sounds like the dream.
I wish there was more thoughtful integration of git into the nixos-rebuild workflow; like, to achieve commits in lockstep with NixOS generations and some sort of association between the commit and the generation hashes? I guess people might do this with hooks?
Not CI/CD but a cron job that runs a script that git pulls my nixos config from my git server and does a nixos-rebuild switch.
Then I also have syncthing syncing my home dir for all app configs/states across machines. It feels damn close to using the same computer when I switch from my laptop to my desktop.