Package version control is pretty dumbed down currently, you can only pull or push changes, which works when you want to sync assets across places.
But what about cases where multiple developers are working in separate places, be it different place types or they are using Rojo and are forced to use separate places to sync? They might edit the same package in multiple places and have no tools to resolve conflicts besides manually transferring changes, which is a huge hassle and defeats the whole point of packages.
Similar to Git, there should be a merge feature for packages that lets developers merge conflicting changes.