While having fewer computer controls in our cars may beneficial in some ways, theft-prevention is certainly not one of them.

My dad had an early-80s Ford pickup when I was a kid. The cylinder in its ignition switch was broken in a way that you could hop in, turn the ignition switch, start the truck, and drive away -- all without a key. The ONLY thing preventing extremely easy theft was a few tiny pins in a lock cylinder.

This is an extreme case, but it illustrates how easy it was to steal cars before modern theft-prevention: bypass the mechanical lock to connect a couple wires together, and drive it away.