I don't visit here often anymore, but this topic caught my interest. I wore a beard for a few years before I stopped associating (I was raised a JW) and I still do. My elders in a California congregation didn't particularly like it, but they accepted it -- I was allowed to give talks on the Ministry School in the Main Hall. Some in the congregation told me that I was setting a bad example for the "young ones", even though I wore a short, well groomed beard. I knew that there was no valid scriptural reason for the objection. No one in the field ministry ever questioned the beard or even noticed the beard for that matter. Only the JW's cared one way or another.
Make no mistake. The issue of wearing a beard is about one thing and one thing only -- conformity. Not unity, not Christian brotherhood, not "stumbling your brother", not appearance befitting a minister, but conformity. The military uses it effectively, as do cults and other religions. A simple fact of human nature is that if you force everyone to look the same, it is much easier to also make them think the same and not question their authority structure. Since the JW's attempt to control the lives and thinking of its members, it is to their advantage if they can also make everyone look the same. Independent grooming leads to independent thinking, which leads to questioning their self-appointed authority, which leads to the realization that the JWs are a cult. We can't have that, now can we?