Funny thing is the movie was originally supposed to have a line near the end where Belle says she wants human!Beast to grow a beard, but apparently the line was veto'd by some higher ups who thought the line would imply Belle has a slight bestiality thing going on.

Thing is I think most audiences preferred Beast in his "monster" form because it's the one we spend like 99% of the movie with, and while him changing back to human was meant to signify how he had changed his once cold and judgmental ways, we don't get much time to see how this reflects on him as a human.