pdxa4
Longtime VW/Audi owner
There is nothing special about dealerships or the guys that work at them. Do your own maintenance. You will be more critical of your own work, more concise, and take more care to do things properly than a dealership or any shop technician ever will.
Exactly, after all these are then "highly trained" technicians who don't know how to correctly drain and fill the differential.
For a low volume car such as the R it is better to do maintenance by oneself, or else go to a good quality local independent VW/Audi shop.