When to use git subtree?

Question

What problem does git subtree solve? When and why should I use that feature?

I\'ve read that it is used for repository separation. But why would I not j

Answer 1

To add to above answers, an additional drawback of using subtree is the repo size compared to submodules.

I don't have any real world metrics, but given that each time a push is made on a module, everywhere that module is used gets a copy of the same change on the parent module (when is subsequently updated on those repos).

So if a code base is heavily modularised, that will add up quite quickly.

However, given storage prices are always coming down, that may not be a significant factor.