[adev_]

Nix is far more than just an app with its own directory (Which is also the flatpack & snap approach):

A little not exhaustive list of features that Nix provides:

- Not only an 'app installer'. It is a fully feature functional build system where reproducible builds are guaranteed (This is unique with GUIX up to my knowledge) on any linux distribution. Safe-reliable distributed builds are also possible.

- Fine grain de-duplication of dependencies (libraries, frameworks) to save disk space

- Safe, unprivileged installation of binaries in a multi-user environment on a single machine.

- Atomic upgrade and rollback

- Allow multiple variations of the same package with different options & versions installed in parallel without any risk of conflict

- Solves definitively all ABI breaks problem you encounter on traditional package manager, even with shared library.