Your parenthetical is just wrong. The setup for a new virtualenv requires access to the internet, iff you choose not to a) bundle the packages in a libs dir or b) have a locally hosted mirror of pypi or c) have the libs in your system packages already or d) a dozen other things.

Of course this is true for setting up any development environment. You have to get the dev environment from somewhere at some point to bootstrap the process.

Your entire parentheical screams FUD, and obviously disingenuous FUD at that.