Nooby - I would hope that someone with that amount of experience could handle a Robby well but more importantly know where to avoid turbulence in the mountains and how to deal with it if encountered.
If it isn't an issue, why have DoC NZ taken action following a series of incidents???
R22 - goody for you, I suspect what you call getting the sh*t kicked out of you in turbulence probably isn't very high on the scale.