But c’mon there’s no such thing as safe brain surgery. Would you then market brain surgeries as unsafe?
Edit: and there is no way to prevent that damage except by detailed planning and by stopping to cut when the patient (under local anestesia) ceases talking or performing their craft. Other damage can only be detected later though.
It’s like you have gone out of your way to prove the opposite point of what you were ostensibly trying to prove.