eh, modern ECUs, accident compute, etc are doing timing and tuning calculations in real time such that you need something a little more adequate. A 40mhz PowerPC CPU with an FPU, for example.

Aside from mandatory ADAS, most cars can definitely get away with "90s tech" but probably not "80s tech"

The 6502 in my argument was meant for something like controlling seats or mirrors.

The ECU obviously needs more compute power. That said 6502 was an over exaggeration.

fwiw modern car buses have signing and authentication - using a shared bus significantly lowers car weight and increases reliability, but also introduces security challenges. signing operations are too expensive for a 6502