What is a car? Is it 4 wheels, a driver seat, passenger seat, three read seats, and a trunk? Or is it an efficient means for getting from point A to B on paved roadways? If a "car" is the latter, then there have been plenty of advancements. Electric scooters and bikes are two pieces of tech you can very easily take with you.

Your car analogy doesn't really work. It's like saying "desktop computers are mature tech, can I fit one in my pocket?" No, but you can fit a smartphone in your pocket, which does many of the same things a desktop computer can do.

Sure, you can buy a 1:76 scale electric car for around $80.

Yeah. RC cars can fit in your pockets. But you can't be the passengers.