Cars have made pretty heavy use of electronics for around 30 years at this point. My mid-90s car has electronic fuel injection, computer controlled transmission, a dozen sensors in the engine bay, anti-lock brakes, keyless entry, power windows, motorized seats, heated seats, digital cabin thermostat, cruise control, etc. There's even a stereo.

Obviously new cars are in general an upgrade. Most people driving old cars do not do so because they want to, they do it because new cars are too expensive.