Originally Posted by GDK:
“Much as I too dislike beards, I think your reasoning is flawed, Tom.
Surely to be clean shaven is as much of an aesthetic choice and vanity as a "nicely" trimmed beard? The choice is about following social norms to gain social acceptance within our society and current male fashion within our culture, nothing more.
Having an unkempt beard is the natural, unaesthetic choice.”
I didn't say I disliked beards... that would be a tad hypocritical of me :P
Being clean shaven can be about vanity but it can also be about keeping very simple maintenance, like, say, shaving your head. And that is how I see it being for the Doctor. To maintain an orderly beard you have to take care shaving. Not so with going clean shaven: there you just have to be thorough in removing the hair. And I would imagine the Doctor would have some very quick and straightforward way of doing that. I don't imagine he sits with a straight razor. More likely he stands in front of some sort of futuristic hair removal device or uses nano bots or something equally Sci-Fi.
Of course this is a fairly trivial matter of characterization (as it's a trivial topic in fairness) but I just see the Doctor as someone not especially vain (at least aesthetically speaking) but fastidious enough to want to have a tidy appearance, if only for practical purposes and the self-awareness of having to be around other people. To me the best expression of that is clean-shaven. Why have unnecessary maintenance?
Of course, following the same logic he would shave his head as I noted above...