A: You avoid issues such as Readme files stating, "before compiling you have to git clone ../commonA, ../commonB". These always tend to get stale so in reality you also have to git clone ../commonC wasting you tons of hours of troubleshooting.

B: Developer working on daily basis in component A finds a bug in component B. He just has to change the code and commit it for review, instead of understanding the specifics of working with component B repository.

We have one large-ish repo that keeps showing "This repository currently has approximately 547 loose objects.”

We keep pruning and gc'ing with different flags, but pulls just seem far slower than other smaller repos.