Because the thing that is being forgotten: Regardless of how much power someone has, if they tell you to "stop being a dick", at least stop and consider (and I mean REALLY consider) "am I being a dick?". And if you are, stop it.
Switching to my moderator hat for a moment: Guys, this is a good discussion, don't ruin it by getting this thread locked. I won't name any names, but if you have recently called someone a "stupid asshole", you should consider yourself warned.
Back to the thread:
That is a good point, but I think the merits of modeling the surgeon's entire body are more than worth any limited motion. Besides, imagine the horrifying achievements that can be added when you have your entire body to screw with