For sure we can fly with rather wide margins of precision and not wreck airplanes....however if it is not all that difficult to be very precise in our ability to judge closing distance to the landing area and be very precise in judging the height of the wheels from the runway then why not strive for that level of proficiency?
I agree completely, When I used to fly gliders I would hold off feeling the swish of the grass against the mainwheel, so was maybe an inch or two above the deck, and revel in the fact that I could do that. However I still don't have a clue how I do it! I just fly it so that it looks and feels right. You know when it's going tits so you just make those unconscious movements to correct.