> Imagine a building whose design and construction was governed by democracy

I haven't seen that, so it's hard to imagine (and I would thus reserve my judgement on that). But I have seen comedy governed by democracy, and it's not as bad as you suggest: https://en.wikipedia.org/wiki/Monty_Python But I do agree it's a mish-mash. :-)

Anyway, I think it's hard to make the OSS model work in politics. In politics (and other fields), you are severely resource constrained. However, in OSS model, anybody can fork the code on their own system.