Thanks for sharing your insights into this, and also for looking up the reference forum posts. It’s especially these kind of discussions which will help me design a good user interface for groups-in-groups / tags / data-driven-maps. I need to see most cases so I can come up with a UI which is both easy to use and works for a wide range of uses.
I can say that this will be implemented in the future version of Maphub. Right now the priority is team collaboration and releasing the stable version. This UI change will come after that.