[crabbone]

This is not as much about a package manager as it is about conventions and necessary dependencies.

Standards ensure that going forward language semantics and syntax don't change. Having minimal dependencies ensures program longevity. Package manager cannot solve these problems, no matter how good it is at its job.

Python doesn't have a standard, it's heavily reliant on dependencies which are very plentiful and similarly unregulated. A program written in C that uses only functionality described in some POSIX standard will endure decades unmodified. Even Python helloworld program went stale sometime ago, even though it's just one line.