Oh, I totally agree with you. I do robotics, and my company inherited a multi-repo approach kind of by default from our upstream ecosystem (ROS). So we get a lot of the benefit of our upstream having tackled a number of the issues around having a product made up of hundreds of repos.

Now, our upstream doesn't _actually_ ship very much, and what they do ship is relatively slow moving. So we've had to extend the supplied tooling in various ways to truly meet our needs.