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If I remember right the best predictor for a doctor getting sued is whether patients perceive the doctor to be friendly.
Advising against a unnecessary practice might be malpractice but informing a patient about the option to do so, especially when there are cosmetic reasons for it, shouldn't be a big issue.
Even good doctors can get sued. But it speaks to more about why people sue; (doctors did a bad human-interaction job rather than they did a negligent job)
I do wonder about the nature of doctoring. Do you happen to get 3% (arbitrary number) wrong; and if you are also bad at people-skills, this bites you. whereas if you get 3% wrong and you are good at people skills you avoid being sued 99% of those 3% of cases.