Yes, but that is really the performer's problem, not mine. Perhaps, all those mannerisms help some performers to call upon their full potential. If you took away the mannersims from those who genuinely have them (as opposed to those who carefully choreograph them), their playing would probably suffer.
When talking about mannerisms in pianists, I always ask why we are not willing to put up with them, but are perfectly fine will the mannerisms that string players exhibit. Watch a chamber music performance. If you took away the huffing and puffing, and the swaying and shaking, and the tapping, something would be missing, wouldn't it?