No one NEEDS Paeon in combat. Everyone needs to learn TP management. It is quite easy on BRD to hold back a few heavy shots when your TP is low. Your DPS will be a good bit higher than if you used paeon. And if you factor in the DPS gain your casters will receive by using Foe's instead you will understand that it makes no sense to use Paeon in combat.

You are on the same server. Feel free to run some tests with me if you have doubts.