User blog comment:PFC Arkalis/Battlefield 3 Destruction Gameplay video/@comment-1916935-20111013040407/@comment-3479148-20111013182934

Maybe to refine it. You (most likely) saw some of the glitches still in the Beta. Destruction 3 would have just worsened the situation if it presented bugs of its own. Of course, you could imagine it as "buy for full features" if you don't like my explanation ;)