Nick Coghlan added the comment:
Emily's answer sort of covered the "It's not as simple as it might seem"
aspect, whereby the bit that's genuinely tricky is to provide access to the
system pip(/setuptools/wheel) without providing accessing to the system site
packages in general.
If the latter is actually considered desirable, then the most suitable venv
configuration is likely to be:
python3 -m venv --system-site-packages --without-pip
as that will give you a fresh venv to install your own additions into, but use
the system pip package by default, rather than automatically bootstrapping a
venv specific instance of it.
We don't currently discuss that kind of hybrid configuration in the docs, so it
may be appropriate to reopen this as a docs issue, and add a new "How do I use
system level Python packages from a virtual environment?" question to
https://docs.python.org/3/installing/#how-do-i
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