Python barely survived becoming the default scripting language on Red Hat and other Linux distros which was a major obstruction to the Python 3 transition. If the new cohort of pandas and scikit-learn users had not been such a force of nature we”d be talking today about Python the way we do about Perl.
Not installing venv is a serious crime on the part of Debian as beginners don’t need any more excuse to trash their system with site-local directories and other wrong answers for how to manage packages in Python.