In general you can't just use a package manager in many cases. Or you can, but it'll be even more painful. Imagine that you're working in some sort of mono rep

In general you can't just use a package manager in many cases. Or you can, but it'll be even more painful. Imagine that you're working in some sort of mono repo, except that some internal libraries are submodules. Then you'll often find yourself working outside and inside submodules to test changes. You can't do that easily with package manager. That being said, I believe it should be possible to augment (some) package managers to handle local path only when in dev mode.