taking off for the first time

I have never piloted an aircraft. I do flight simulation from time to
time. Currently I am messing with radio controlled aircraft. There are
simulators for that also.

Having only simulation experience, but I'm wondering about how piloting
is taught. Getting to the point, why not use a long runway and have the
student take off just enough for the wheels to leave the ground and
then immediately touch down?

Again, inexperienced with the real thing, but isn't landing so
difficult/critical to warrant special treatment like that?

Trainer runways are not long enough?
The wear and tear would be too much?
That maneuver would be too difficult for a beginner to coordinate?

Genuinely curious. Thank you.