i agree.It can be if the players understand that!
Really it's not an issue either way. If they go quick and you're not happy to allow play continue its no problem to call it back.
I was thinking of the other way round - player has the ball in his hand shaping to take a QTI .. and a defender is in front of him defending it ... but actually the QTI not on.... or is no longer on. And you want to signal that to everyone