I don't give half a shit about the physical appearance of my doctors - what could it possibly say about their competence as a doctor?
Maybe he's so skilled that his employers (e.g. hospital) disregarded his appearance?
Or perhaps you were thinking if he's sloppy with his appearance, he'll be sloppy providing care.
As another example, it's not unusual for top-level sports coaches (e.g. soccer, tennis) to be older, and to be overweight - it's their past experience that is useful, not their current appearance.