This reasoning is great and makes perfect sense. The thing that makes it look like performance art is where Urbit appears to replace that complexity with something incredibly obscure that does not look like it will do anything helpful.
I'm daunted by it, but I'm intrigued by it. I'm also pretty convinced that if I devote some time to it, it will make sense. And as a bonus I'll probably understand the rest of my computing a little better as well. Which is why I'm cloning the repo right now to have a play.
PS. Big repo. 400mb and counting.
https://git-scm.com/docs/git-filter-branch
But this will sever history with all cloned copies, much like rebasing master would.