Yeah, modern cars are basically engineering marvels. Even when a lot of this stuff was mechanically controlled it really was something amazing to see just how precisely every little moving part did its perfectly timed function, thousands of times per minute across all 4 (or 6 or 8 or more) cylinders, pushing power through the transmission and differential and wheels.

That said, I still think that trying to understand the physical ground truth of the electrochemical energy stored in each of the 5000+ cells by reading sensor data on voltage, current, impedance, temperature, and a log of how many times each cell has been charged or discharged, does require greater electronic complexity and more sophisticated programs to manage, than an ICE control unit does.