I have wondered for awhile. If you can just turn it off and turn it on for no cost or GCD why is there even a penalty attached to it? Most of the time when I heal and want to use it I turn it on and use it, but some times I click it off and it lags and doesn't switch off. Why is there an on and off mechanic when there is no penalty to it whatsoever?

Cleric Stance
Grants 95% INT from MND attribute ratings, while increasing potency of attack magic by 10% whilst granting 50% Accuracy. Effect ends upon reuse. Cannot be used in PvP areas.

This means it would just be a passive buff. You would not need worry about lag affecting you.