The basic premise of an electric "engine" is simpler than that of an ICE, but when you actually make the car, it's nowhere near as simple on paper. Just look at the issue people have had with getting Tesla's repaired... the "mechanics" don't even know that you have to keep the battery charged.
Also, don't ignore the fact that we have 100+ years of experience with ICE.
Also, I would argue electric motors have been around far longer than ICE because it is simpler. https://en.m.wikipedia.org/wiki/Electric_motor
I've been through the CRT -> Flat screen television phase in India.
Arguments were typically like these. How will TV repairmen fix these new TV's which have move like plug and play internals. Therefore new flat screen TV's won't sell?
In the end it didn't work out well for TV repairmen. If its easier to identify and swap the malfunctioning part, you need lesser and lesser skilled professional to service these goods. You can dumb down the process to a point anybody can do it.