The ball up and manufactured "good" bounce simply lends itself to set plays and defensive tactics. How easy is it for a team just to close it in when you can predict the movement of the ball. IMO there is no compulsion whatsoever for the umpire to perfect a "good" bounce. Just let the ball hit the deck, players need to spread and anticipate...the game opens up and you've got footy how it should be played....not the rolling maul.