Electronics are not minimal on an ICE. Sure on a very old diesel engine you could make that argument. But modern cars require a whole suite of electronics just for the engine to function. You have position sensors, engine controllers, air flow sensors, emissions sensors, CAN bus modules. Sure it is possible to make a vehicle without those but that vehicle will not be nearly as efficient as modern vehicles, won't run nearly as long, and people won't buy it.
Largely the main issue is reliability has nothing to do with it. It is all producibility. Currently every car company is struggling with producing vehicles ICE or EV. Nobody is asking is the Ford Bronco sustainable? Even though the wait time is longer than the Ioniq 5. Vehicles that people are not as excited about like the Prius or the Bolt are available right now.