The root of your monorepo should have very little in it – A README, some useful scripts for managing workflows maybe, etc. It certainly shouldn’t have a “src” directory or whatever the local equivalent where you put your code is.

But given this distinction, I think almost everyone will benefit from organising their code this way.

For me the single biggest advantages of this sort of organisation style are:

1. It is impossible for your code to get out of sync with itself.
2. Any change can be considered and reviewed as a single atomic unit.
3. Refactoring to modularity becomes cheap.