As true as it is that monorepos require specific tooling to make them work, the same is true for any polyrepo setup as well. The main tradeoff is the price you pay when you don’t have this tooling in place yet.

But I agree: Always go for a monorepo mostly because it makes most things go faster.

https://kore-nordmann.de/blog/always_go_with_a_monorepo.html