Ack-Ack, but if you're in front of a car it might help to know how fast it'll stop when you slam on the brakes -- which you really get a feel for by driving one yourself
(just continuing your analogy)
I think some folks are taking my comments personally. And taking them out of context. I never said there was a set number, I never said there was a hard demarcation line, but The pilot that's flown the entire planeset for 8 years and the pilot that's flow 1 plane for 8 years, side by side, the more experienced pilot is probably the better pilot.
To make another analogy, you can read about how to operate on somebody, but they don't give out the diploma until you've actually done it a few times, too.