That makes it immune to dependency hell; there are no two packages you can't have at the same time due to dependency version conflicts. The big wins for me tho

That makes it immune to dependency hell; there are no two packages you can't have at the same time due to dependency version conflicts. The big wins for me though are: having all my system configuration in a small set of versionable text files (rather than gigabytes of mutable state), and being able to attach dependencies to the scripts that require them rather than to the system they're expected to be run on. (I use NixOS, but it's the same concept)