I used to like the idea of nixos because it felt “tidy” to configure everything centrally. However that tidyness is achieved by adding an extra layer which just replicates the configuration options of every program. If there is a bug in that layer or something is just not implemented, either you have to learn the whole inernals of nixos and nixpkgs, for which there is no real documentation, or you have to resort to doing things imperatively again, which is hard because of the opacity of the generated system and also defeats the whole purpose. So basically, you are completely dependent on nixos developers for things you could have easily done yourself on arch.

Who on earth changes their smoke detector every six months?

Discord being proprietary should be reason enough to try to replace it

I switched to Nixos after reading a lot about it and eventually switched back to arch because I didn’t like how hacky everything felt. On the surface it seems really clean because of the central configuration file and the reproducible nature of the whole thing, but in the rare case something doesn’t go as planned, it’s hard to know how to do anything about it. Basically everything that would have been a configuration issue for you to fix, is now a bug. Also, I found no easy way to install software that isn’t in nixpkgs (which is rare, but happens).

Mounting the home partition at /home in the installer should work. Deleting the /home of the user you’re logged in as isn’t going to work because the applications you use to do it will most likely try to write something into ~/.local or .config, so it’s never really empty. You could log into the root user though and do it from there.

Btw. It’s not really beneficial to put your home partition on an HDD for the same reason. All Programs you use are going to have to access some hidden config or data files so it’s going to slow everything down. (Also in case you use Steam, it installs all the games in ~/.local) A better way is to mount the HDD somewhere else and symlink your ~/Documents, ~/Pictures etc to the HDD.