Hurts airframe more than engine?
Just a reminder that when you pull over the limit, it is not only the engine that could be damaged, (or not reach it’s TBO without power loss).
The drive chain and in particular the rotor systems have to work harder, and they also may suffer excessive metal or structure fatigue.
In part, the recent blade problems were probably caused by inadvertent over boosting; there was a belief that you can never hurt a Robbie, if it can fly then it is OK. Wrong!
The design life of this excellent machine built to FAR 27 standards is based on you not over boosting (exceeding graph limits) of the engine.
Be kind to your Robinson, know when too much is too much – metal does have memory.
Happy flying..