As a matter of practicality I agree but for one not everyone knows this and for another distros like debian don't support what you are saying. We are resorting

As a matter of practicality I agree but for one not everyone knows this and for another distros like debian don't support what you are saying. We are resorting to pyenv because distros refuse to maintain different application specific python environments. You can pin python versions and deps per package if needed.