eazybee
I enjoy watching the dance moves because it makes a concert into a performance. So many choirs sing well, but are as dull as ditch water to watch; some members rock back and forth, too many look down, don't project and lack animation.
In the concert I watched recently, every one was completely in time and everyone looked as though they were enjoying themselves, which makes it a pleasure for the audience.
If they rock back and forth, look down and so on they are not being properly trained. A choir can sing well, stand still and their faces can be animated - they should be looking at the conductor.
The choirs I sang in tended to do Bach, Mozart, Britten, so jigging about was not part of our performances. The only time I was asked to move was when we sang some happy-clappy hymns for a visiting celebrity. I suspect I was not very good at it.