The point is in "required". The makers can do the car report anything that they want, but older cars often report the bare minimum. If your car has android is modern. The difference between a car made before 2000 and a car from 2005 is huge.

Cars currently are really sophisticated computers with tires. There are a lot of systems all managed by the central ECU. Things like airbag, electric windows, seat heaters, electronic brakes, ABS, coolant circuit... each one are managed by its own circuit.

Not needing oil changes or air flow meters for the mix, electric cars will be much more simplified in some parts but I bet that are absolutely arcane in the other. And the battery can kill you easily.