I made a simple CLI wrapper that automates this, like Poetry does, except my wrapper uses pip.
Although your tool looks more like Virtualenvwrapper.
It's good to have other options of course (and yours looks nice), but it's also good to at least make a case for improvement over what's already out there.
I have, actually (though not Pipsi). Some others have commented on that and lead me to them.
Part of the "fun" of it was just doing it, I guess, and knowing exactly what went into it. Just a few lines of Bash, really.