PRs and other things could also just live in a "shadow repo". Even if just by convention.

You have a `Product` repo and a `Product-meta` repo.

The biggest issue I have with using git as a truly decentralized system is remote management. Unless you want to be manually futzing with remotes on every single client and pushing/fetching from others correctly, you need some kind of central server.

I really think there is a hole here for a product that works with git underneath, but gives a nice easy way to manage all that complexity.