Given that by some reasonable definition we already have driverless cars, albeit limited to two cities, why does that sound implausible to you? Cars that can d

Given that by some reasonable definition we already have driverless cars, albeit limited to two cities, why does that sound implausible to you? Cars that can drive everywhere, in every condition, without humans intervening at least remotely and occasionally in some limited way? Probably not. Robo-taxis in most major cities and trucks that can reliably handle the full interstate network, to be picked up by a human driver for the last mile? Why not?