So OS vendors want Python to be invisible to the user. They want it for system purposes, and they want to distribute python apps, scripts, and packages on their own terms. Cool. Let's pick another group: academics and researchers.
They want to do their research. They don't want to program Python. They want to work their data, create visualizations, and very importantly: they want fellow researchers to be able to use their code. These folks don't really want to think about packaging.