git submodules tracks the version of the sub repos. So if you organize that your releases are a master repo with all needed repos as sub-modules, your sub-repo

git submodules tracks the version of the sub repos. So if you organize that your releases are a master repo with all needed repos as sub-modules, your sub-repo version tracking is already done fr you. All that while still allowing sub-repo to move forward faster than other repos. With a mono-repo, you can only allow some sub-system to go forward faster than others by making them live permanently in separate branches. Basically, in monorepo you have to use branches to do what separate repo do normally for free. (Then there is the issue that with a monorepo, any screw up screws everybody. You're all on the same boat, all the time.)