2: AGREE, I HATE moving dance practices unless it helps in any way (for example Jun's Psycho Dance practice that has both the fix and moving ver. In the moving ver it helps that they show his laugh from a different angle since just from the front is difficult, and the fixed ver is great because the camera doesn't move)
I agree with everything honestly, I do care about lipsinging but only if it's a concert. I can excuse lip singing in a concert tho if the choreography is really damn hard or extreme because obviously it would be hard to sing at the same time in that case. I do not mind that much when songs have repetitive lines since I find it nice that it gives it some structure.