I do wonder if not being able to follow through on the controls closely (either with your arm in the air or holding the centre upright) has been a factor when mast bumping has destroyed the aircraft during autos and PFLs when converting FW pilots to RW - an engine failure in a FW normally elicits a forward control movement in a FW, not what you want in a teetering head RW when the lever is dumped.
I'm not sure that's too much of a factor, TBH. You can follow through perfectly well with the Robinson style cyclic, and the input is the critical thing. The instinctive "forward stick" needs training out of any FW pilot going to RW, irrespective of the rotor head design. I do agree that a teetering head makes that initial reaction a lot more critical to maintain RRPM and avoid low g.