Python Packaging: Why don't you just?

The state of Python packaging

Python predates the common packaging ecosystem we all interact today thus it has some artifacts from history
back in the day, for someone to use a dependency, they have to download the source; in Python's case, they chose with the most common way to download a file: simple tarballs
as more platforms grow and being supported, there are more incentives to make delivering dependencies faster but each output may contain different metadata; this results in big packages to create huge lists of possible outputs
for the package manager to know the metadata, it has to download the whole package and run the build script
however, this simplicity also brings advantage that you can simply create a Python package repository by simply building the wheels and dropping them along with the source in a directory
another artifact to consider is Python supports a lot of platforms; it is considered supported when Python is confirmed to run on a platform; it cannot support building all wheels for all platforms so at some point when doing a pip install of a big package, it has to build the package from source
metadata are just placed in files which is a good thing since they can be placed next to the sources

third system effect; the first few efforts went well but some people want to create a better system with more ambitious goals and a grander vision; except it didn't work out and the attempts will inspire another group to try a better version
the quick succession of attempts at standardizing Python packaging fragmented the packaging process by offering multiple ways to do the goal; as more attempts have made, there's lesser central driving force