Kipping is great when you're competing for maximum reps in a certain amount of time. You should be able to do the strict exercises first, of course, but the point of kipping is for a competitive advantage -- kipping is ridiculously less taxing on the muscles, and makes pull ups / muscle ups more of a cardio contest than pure strength.

Dribbling looks hilarious too, and basketball is supposed to be a passing game[1], but dribbling isn't illegal and gives the player a competitive advantage in the same vein.

[1] https://en.wikipedia.org/wiki/Dribbling#Basketball