Python finally offloads some batteries

That seems like wishful thinking at best. It is not nearly as stable as you think it is. Most python packages only support of subset of python reasons for lots of good reasons. If large swaths of the python library are now in PyPi they also now gain complicated dependencies between them as well. Maybe the kernel's driver API experiences more churn, but the point remains.

As NYKevin pointed out the requests module depends on urllib (yikes) so if that module gets removed from the standard library then you've broken requests for the latest release of python.

If tons of important modules are ejected then the core teams haS to stop removing or deprecating things to avoid the same dependancy hell the kernel would have with out of tree drivers.