Wow, that reads like features a modern package manager should have! Now I am torn three-ways on the question of the next distro/package manager I should try ou

Wow, that reads like features a modern package manager should have! Now I am torn three-ways on the question of the next distro/package manager I should try out: nix is a strong attraction because it also does a lot of cool stuff (especially the multiple versions thing, which I think is a better solution than 3-sat solving), and Ubuntu's snap{d,craft,-whatever} because it is a better real-world solution for third-party packaging needs.