
The coaches probably know the stats of how often predictable kickins don't work vs how often unpredictable ones do. Much as fans hate to see predictable kickins, the stats might be in their favour.
You have to take into account the opportunity cost. Nobody is talking about eliminating long and boundary kick ins altogether, sometimes, especially with set shots, the zone is already set up, so by the time a player has ball in hand and is standing in the goal square, there are no viable options. But when a shot is missed in open play, there's a much greater likelihood that the opposition can't cover off all options available to the kicker if they're quick to the square. Now, if we've got players that we don't trust to spot a bloke in the open and execute to their advantage side to get a quick play on going, then they shouldn't be in the 23 in the first place or even on the list for that matter.