When you factor in something unusual, like a Wankel engine, the experience gets exponentially worse. Just browse any RX-7 or RX-8 forum and you'll see nothing but horror stories whenever anyone asks "where should I have my car serviced?".
So much for the dealer's investment in "expensive equipment and training". They don't... they hire the cheapest labor that meets their loose requirements.
Now take that difference even further and eliminate the ICE and replace it with 6k+ Li-Ion cells with their own cooling system, an AC induction motor, high powered inverter and the related heavy cabling, and you're going to have massive confusion and problems in a dealer whose primary sales and training is for conventional vehicles.
Of course, a possible answer could be _exclusive_ dealerships with _extremely_ strict requirements for training and such, but I'm sure there are probably laws against that as well.