Then neither is snooker, where reds need not be called and you can't always know before or after the fact what the player's intent was. Same thing in three cushion, where you can't always tell what the player is or was attempting, but you do know what constitutes a successful shot. Guess we better get rid of one pocket, too, where you also can't always determine the player's intent. Pool only has fans because it was smart enough to evolve past call shot games like straight pool, which are less fan friendly and more difficult to follow than games in which calling is not required. I've heard people suggest that 10ball would overtake 9ball since the late 1990's. It hasn't happened, and it won't happen anytime soon. It's not what the spectators want.