Bad comparison. Brain surgeries are a method of last resort. They are unsafe because there are significant knowledge gaps in our understanding of the brain that might take centuries more to fill. Every time a neurosurgeon cuts, they are potentially doing irreversible damage to an important part of a person's consciousness, abilities and memories.
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.
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.