That's just a matter of man power. Things take time, this sort of tooling wasn't the priority. The community was able to easily take over that space, and relying on Maven was a great way to start off.

If you look at Python, Pip appeared in 2011, where as Python launched in 1991. And if you look at the Python scene, it's pretty messy as well, just read this guide: https://packaging.python.org/guides/tool-recommendations/

Pip isn't even the recommended one to use anymore, slowly being superseded by Pipenv, yet you also have Poetry and conda and to package things you still need setup tools and you have to use twine to submit wheels to pypi, etc. And I still see a lot of guides telling you to use easyinstall still.

In Clojure, you had Maven first as the de facto, then Leiningen became de facto, and now you have an official one with tools.deps as the new de facto.