I think it is a funny subject. I did not try to learn to wheelie. I just learned to ride and wheelies were a bi-product.
I know guys that can wheelie like there is no tomorrow, but when the road turns and they are on two wheels, they have no idea what to do. No different than the busas and zx12 riders that want to drag race down every straight line, but hold up everyone on the exit ramp....
I consider neither a skilled rider. They have developed a skill, but never learned to ride their bike - I am not even going to use the word properly hear. I simply mean they have no clue of mastering their machine, they have only mastered one simple task - throttle control in a straight line.
Now that I have aired my un-asked for opinion... I would say controlled environment.