PEP 405 vs 370

Fri May 25 15:45:23 EDT 2012

http://www.python.org/dev/peps/pep-0405/
I don't get what PEP 405 (Python Virtual Environments) brings vs what we 
already had in PEP 370 since Python 2.6.
Obviously 405 has a tool to create virtual environments, but that's 
trivial for PEP 370 [1], and has support for isolation from the 
system-wide site patch which could've been added in addition to PEP 370.
So maybe I'm missing something?
[1]
PYTHONUSERBASE=~/my-py-venv pip install --user Whatever
will create ~/my-py-venv and everything under it as needed
PYTHONUSERBASE=~/my-py-venv python setup.py install --user
the same without pip
-- 
damjan