Many years ago I helped a friend with some draft that had to do with him finishing his doctorate. It ended up being maybe 50-60 between three of us and as fine grained as possible.

That agents need something "beyond git" is lost on me but it keeps coming up. For one subject the tool doesn't matter -- in fact it can be obtuse like git or bash and it's fine because agents will handle it. Then for another thing the story is opposite.

The interesting question is whether agents actually benefit from finer-grained history or whether they're better served by semantic checkpoints – "this works, this doesn't" rather than line-by-line diffs. Git wasn't designed for that, but neither is anything else yet.