because the producers/directors/editors/whoever decides what camera angles to show and when to cut between one and the other don't know how to film dance. They don't focus on one dancer for long enough to get a sense of if they can really dance, and they don't focus on a group dancing for long enough to really show the choreography. I would go totally insane and start yelling at the screen.

It would be a totally awesome show to watch in person though!