I'm a fader; been a JW for decades. I've been to meetings, assemblies, and conventions across the U.S., and I have never (I mean never) seen a brother on the platform with a beard or goatee. The only acceptable facial hair for a JW man is a mustache.
Perhaps things are different in other countries, but in the U.S, elders and servants are not permitted to have beards. In fact, when I was growing up I was told that you could not be on the Ministry School if you had a beard--but I've never seen that in print.
It's common for younger JW men to grow some facial hair when on vacation, but they always shave it when they come back home and go to a meeting or service. I think that most young (under 40) JWs realize that the beard rule is dumb. It wouldn't surprise me if it goes away in the next 10-20 years.