This is why I'm a fan of tools like Bazel, where you can still get most of the tooling benefits from a single repo, but get testing speed benefits (and, if you

This is why I'm a fan of tools like Bazel, where you can still get most of the tooling benefits from a single repo, but get testing speed benefits (and, if you roll that way, the design benefits from the separation) of a multirepo setup. Unfortunately it's hard for me to recommend Bazel, it's such an uphill climb to get things working within that system.