Exactly why they are counting! It is the fault of the crew to administer a ball knowing 6 are on the floor. This is pre-gamed that the ball is not put into play until all 3 officials confirm with each other we have 10 players.
Never has a coach been upset. It’s exactly the right thing to do. Officials are game managers of the contest.
THIS ^^^
The rule is there bc it’s illegal, a technical, to have 6 on the floor during a live ball.