You can hide it until you hit a skill.

The advantage is people can't plan ahead, like say if you know the opponent comp is BLM SCH PLD DRG you pretty much can expect what is going to happen. The BLM is going to Sleep anyone capable of CC, PLD stuns the healer DRG drops burst on healer while SCH will throw in some Cleric Stance Ruin 2 and Energy Drain, so in order to counter that you will have no one stacking on each other, have the Melee DPS Fetter Wards and pressure the BLM as much as possible, Healer hide in LoS, if your team has PLD stun lock the opponent healer Hallowed Ground if you're expecting CC's to come your way, all the while your Range DPS finishes off the BLM. And when their DPS and tank starts to peel their healer when the BLM is down if your team has a WHM healer proceed to go for free cast Repose.

Information wars gives tactical advantage. You cannot deny that.