Instead of trying to make a full electric car, I'm surprised Apple and Google aren't focusing on making a smart AI "head unit" that's compatible with third party car manufacturers. The head unit would control all aspects of the car through the CAN bus and also take camera/sensor inputs from the exterior of the vehicle, and be responsible for things like self-driving, lane assist and all those difficult AI-based features.

This way the car manufacturers could focus on what they do best (building safe reliable hardware) and outsource all the hard AI software problems to tech companies who specialise in this area.