Hey Ref! That's YOUR primary!!!!

[tomegun]

OK, I'll bite. Are you trying to be funny? I'm one of "those people" and the topic had to do with ball watching/calling fouls in someone's primary right in front of them. It was not about a situation like you mention. I will give you an example.
I had a game last night on a military installation so it was men playing. A player passes almost the length of the court and gets hit on his arm. I follow the ball down the court and watch the two on one. He asks about getting fouled on the pass. We have a time out the next play and I explain to him that I'm not going to call that foul as long as the ball gets to where he intended for it to go. In this case it was a two on one break on the other end which led to a score for his team. This can only be done in some instances but the point is I had to see where the ball was going.
If I'm watching my primary and someone passes out of it and you are watching your primary and the ball is thrown out of bounds, who will know how it got out if neither of us follows the ball until it settles? Or, how many of us have seen the ball go out of bounds using our peripheral vision? I know what you're getting at and it isn't the same.