I definitively need NixOS on my desktop (even if I can't digest Nix language) because I want a single system not a gazillion of different package systems unable to handle the whole deploy, anyone updating on their own.

Also I value packagers as the first third party who might review upstream code instead of nobody on package systems that allow upstream to package directly for all distros.

We already knows the Windows classic package idea failure, no need to reproduce it with extra layer of complexity and wasted resources...