Yes I noticed his AOE effect resets, I thought it was from # of uses. If its from conquest update, that makes sense. Kind of sucks.
He's a decent healer. His biggest advantage is the range /variety of bufffs and status removal he provides, instant healing from his potions (no cast time) and instant pro/shell, which is useful for soloing so your healer isn't stuck in a buffing loop while the NM is smashing your trusts
Weakness seems to be his standard heals cap out at 700hp so i usually pair him with another healer. His insta pro/shell also prevents the other trust healer and RDM support from even trying to waste time buffing Pro/Shell.