In that NTSB example it was partly self-inflicted. 230 with only a pilot on board will hover extremely tail low, might even bounce off the stinger - with the pilot usually praying that the stinger is keeping the tail-rotor from hitting something. Other NTSB reports have the stinger slipping into the gap between the net stanchions and causing a tailrotor strike
SEA95LA068. I once came back with the 222 stinger looking like the toe on an Aladdin slipper, but it saved the T/R.
Tough to write regulations that account for helicopters both with intermediate gearboxes and without, but thanks for trying, Jim.
I've reviewed the paper and one comment I can make is that the industry has to put more effort ( ie training and checking) into ensuring the pilots understand markings in the first place.