Git submodules may look powerful or cool upfront, but for all the reasons above it is a bad idea to share code using submodules, especially when the code changes frequently. It will be much worse when you have more and more developers working on the same repos.

Are git submodules a good idea?

Its more accurate to say that git submodules are useful when you want to share code that you also need change along with the consumer of that code. If you're not trying to change the shared code along with the consumer of that code, there are better options for sharing your code.

Why you should use git submodules?

Git submodules allow you to keep a git repository as a subdirectory of another git repository. Git submodules are simply a reference to another repository at a particular snapshot in time. Git submodules enable a Git repository to incorporate and track version history of external code.