They're great for trainers. Short hops with immediate control, low maintenance and operating cost, and you can save the magneto/ignition/etc workload for a different lesson series.
So, make electric airplanes the initial license, reduce the amount of hours to get it, and have an entire course on monomotors before pilots can deal with combustion airplanes.
Exactly. Flying the airplane is the first 90% of flying, managing the engine is the other 90%. So it helps to set one aside while you work on the other.