why are no regions mapped?

This is e.g. Abteiland or Falkensteiner Vorwald. But it’s many many more that are not mapped. But this question is also for Rheintal which is the valley of the river Rhein. Yes, I can search for the Rhein and know where the valley is, but shouldn’t the valley explicitely be mapped since it’s different from the river?

I notice you’ve repeated the same question on several OSM communication channels (sometimes more than once):

I don’t think that’s a fair way of interacting with our community. At least mention the previous discussions for context please.