I think is usually a symptom of how hard it is for the organization to do things, the technical side of this is not actually that hard.

I say this because I’ve gone through a few of these, some with monorepos (the easiest, search and replace and you’re done), some not (yes the hardest but you can just vendor).

At least in the situations I’ve faced this was genuinely not horrible beyond just the organization itself being complicated about the solution.