Everybody has a limit on what they want to see in celebrations--they just don't agree on what it should be. They had to draw the line somewhere--they said no props and no big preplanned multi-player celebrations. Hardly seems to be so restrictive as to take out the fun IMO.
From Rich McKay:
“This has nothing to do with the Lambeau leap, the spike, the sack dance or throwing the ball over the goal post. But the demonstrations are becoming more sophisticated and more pre-planned than they’ve ever been. That’s why we focused on a penalty instead of just a fine.”