The term 'use it' shouldn't have to be used by refs. The reason they do is because an attacking team is taking their time while players regain positions and options become available. If players didn't 'play' to the ref I.e. wait for the 'use it' the game would be much improved.Most team contact sports rely on team mates providing cover and advice as well as direction especially from their captains. Rugby isnt played at lightning speeds half the time the ball is resting on the ground so even a couple of seconds is plenty time to make a decision.