Lu's concern may be valid.
IMHO. All teetering rotors have a lead-lag component. A common solid yoke joins the two blades in conventional teetering rotor hubs. In this situation, one blade may help to dampen the moments that are placed on the teetering hinge by the other blade. In addition, and probably more important, is the fact that twisting of the mast absorbs this lead-lag moment. On conventional teetering rotors, this single hinge (feathering hinges excluded from consideration) is centrally located over the mast.
The fact that the Robinson's coning/flapping hinges are offset from the mast raises the possibility of greater wear in these hinges. This wear would then increase the likelihood of blade damage near the root, just as Lu has mentioned.
I have wondered why Robinson did not exclude the cone/flap hinges and put the saved two or three pounds into beefing up the blades. Perhaps he didn't want to develop 'just another Bell' ('II' or is it 'too')
Whether this is serious or not is a separate question.