> but electric cars seem vastly simpler from a mechanical perspective.
The electric motor is simpler than an ICE, yes.
OTOH, a modern (and by modern I mean anything in the last ~30 years) ICE engine is supremely reliable, so it's a wash.
Most repair time isn't from having to fix the engine or motor anyway, it's the whole rest of the car.
We have a a Fiat 500e (EV) now sitting it's fourth week (not continuous) at the dealer to get window regulator problems fixed. Those types of problems have nothing to do with whether the car was an EV model or the ICE model.