I'm trying to refrain from commenting on this issue since, as many of you know, it's a thorn in my side. However, since I'm the forum's co-moderator....
I feel that applause in ballet should come at pauses within the ballet itself: the end of a solo or a pas de deux, the end of a scene or act, the end. Applauding particular dance steps/movements turns the performance into a circus act. This is an art form and should not be interrupted. In "Giselle", for instance, the dancing is so lovely and the mood so deep that applause is an intrusion anywhere but at the appropriate moment.
I could go on and on.....and I have on other occasions.
Giannina