I think the majority of projects in this world only update everything at once. They haven't investing in testing, sensible api's and testing to allow updating small pieces of their solution.
From my experience, I also think the majority of people who think they have a library and need multi repos to deal with that, don't have a library.
To further clarify, one user of your library means you could stop pretending you have a library and avoid the pain.
I don't mean to insist these problems do not exist, I simply don't think many people have them.
