There is no single place but:
nix and nixpgks. Some issues act as discussion starters.A simpler way would be to keep an eye on the “Developer Category” in the forum.
Nix is not transitioning for the last 20 years. The community recently had a lot of discussion lately and starting towards a better path. It’s moving at such a pace that even official wikis maybe be out of date.
Of course I cannot say if this change will fit your particular needs. As someone who tries new things but not always gets success I understand your frustration.
You caught NixOS when it is “transitioning”. It WILL get simple in the future. And of course there is no ETA.
I didn’t but did you try GNU Guix? It’s supposed to be much more elegant.
PSA: Linux Mint Debian Edition exists.
AUR like stuff is simply not for Debian. You are expected to only use software in the official repos.
If you want AUR you should really use Arch Linux or a easier alternative like EndeavourOS.
If you really want AUR (like thing) on Debian I recommend the nix package manager. It will do it’s own thing without messing with the host OS.
Nobody:
Google: Software Morghulis