It’s hard to hear the judges tell a dancer that she/he has not shown personality enough, or at all. It must hurt their feelings but on the other hand, they are on tv and need to really reach the audience with a great performance, which is a combination of technique and projecting your uniqueness. People will often respond better to a fun or dramatic style of performance over a dancer who is technically sharp only. It’s in knowing how to blend the elements that creates a winner.