I don't have a vote on whether ATProto is a good foundation to build such a thing, it seems to me rather that git has quite a bit of relevant machinery inside already, and maybe it might be extended a little, if only by convention.

but your overall point is extremely valid. lurching from garden to garden is just stupid for something so critical and core to the way software is developed. there should be a meaningful core standard for the data (the commits, PRs, workflows, etc). If people want to innovate and change on top of that great.

that's how GitHub started, but they flattered and turned the screws and convinced everyone that using them was the only viable workflow. for that matter can't we revisit the notion of a 'forge', that's really some product marketers version of how things should work and be bundled and charged for, not anything fundamental.