I've seen a heli flyer that was good enough to make mini crop circles in the weeds... there are not many who can get away with it.
I've never seen the point of hoverng inverted and going down to scrape the head button on the pavement.

I've never seen the point of the 3D fixed wing practice of touching the tail in a hover either. ([:-]Oooo... we can TRY to break it!)
The problem is... the guys who see the experts doing such things and then try it too close in without adequate skill. Those are the accidents waiting to happen. Doing it 50 or 100 ft out... the "crazy chicken" (heli crash flopping on the ground) or the flying flapjack (out of control fixed wing with no tailfeathers) is much less likely to hit someone.