Beard was the part of Arab culture which Arabs use to follow before the advent of Islam. Sunah is something,which prophet did to stand out from the rest and show some civilised manner to Arab people at the time. Sunnah is something which has directly or indirectly had a relationship with the religion and surely beard has nothing to do with Islam. I mean, people pick up the thing from just surface.
Now you could say eating date is Sunah as well but the thing is, date was the only fruit available at the time. You can't expect mangoes, oranges etc to be there at the time. If they were been there, then people wouldn't be saying eating date is Sunah.
Having beard isn't something which u strictly follow just because our prophet had it. Like I said it was part of the cultural due to environment at the time. Because Arab was just desert at the time, and the winds in desert used to have a speed of 70 mph. With that speed, if u don't have a beard, the sand would cut your face and will give rashes and scratches on ur face. That's why u see people covering their face in desert.
Well, I am giving u an advice and surely it doesn't answer ur question.