Google and Meta hit these sorts of limits over a decade ago. They then built new VCS stuff to handle it, Meta's part is the subject of this submission. This was even pre-agents.

Git is just not suited to truly large monorepos, and it won't ever be. That's totally fine, of course. Less of a monoculture here would be great.

fwiw I've heard accounts that Google's source control is also creaking under the weight of AI code changes, and that there's already a new frontend to it with backend revisions on the way too. When GitHub and Google and Anthropic all simultaneously have VCSs that start buckling I think it's safe to say it's a real phenomenon and not marketing.

Did they make a bunch of noise about it, or did HN? This place loses its mind every time OpenAI or Anthropic posts a blog.