I honestly think it is a good idea, no matter which distribution or OS you are on, to never ever depend on system python/pip (or perl for that matter), just install pyenv / pipenv / pipsi (or perlbrew) so you have complete control.

From a distribution perspective I sometimes wonder if it wouldn't be a better idea to call the system python/perl something like system-python/system-perl to make it more obvious they are not meant for use, and have a /usr/bin/python that tells you to install pyenv...