[holmb]

Python is not just a single executable. It takes a little more work than one would want. And for what gain? Would you be fine with other software also requiring a custom interpreter to function? It gets cumbersome.

[mkesper]

If you rely on the system-wide Python you'll need to cover different versions and you need to make sure not to use any 3rd party modules.

[icebraining]

Ansible ships its own libraries, generally.

[jubalfh]

Incredibly. But it seems to be The Ruby Way™…