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It's not applicable at all once you get beyond a few teams.

A mono-repo makes decisions for your teams.

I think Google, Meta, Microsoft, Twitter, Uber [1] and the thousands of engineers that these companies (and many other companies) employ, would disagree with you.

[1] https://en.wikipedia.org/wiki/Monorepo

Those companies largely made the decision for monorepos before there was tooling to support a proper multi-repo existence.

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