Yeah, I wish they'd kept the beta scene for many a reason
One of them (for me) definitely being that Aqua seems to be using more of her graceful Keyblade maneuvers here. We don't really see that in much of her cutscenes in BbS that I can remember, so here--if they had kept this--there would have been less story and gameplay segregation in that, I think.
I wonder what could've been made out of that scene. I mean besides Aqua doing some training, Ventus and Terra look a little weird like the developers didn't know what to do with them in that scene, lol.