[mindslight]

I was talking about systemd. It's each program having its own bespoke template/include/.d/override system that is the problem. Whereas NixOS is intended to be used for every program.

Personally I'd rather clone and modify a full config file rather than only overriding portions. Once I own it, I want to keep owning it - it's more straightforward to track down a problem due to my own assumptions being invalidated, than due to a distribution's assumptions being invalidated. And it's much nicer to read one file for the settings, than having to jump between a few different ones and know the overriding rules (referring to configuration in general here, not just systemd which provides the tools to work with them).

Good point about the daemon-reload. I actually don't have many custom systemd unit files, and they generally don't change. But to be fully correct and not require manual intervention or a full reboot I do need to include that step (although I'm moving away from Debian towards NixOS so shrug).