Healing during FATEs = no credit?

[Nezerius]

Contributing damage is a healer’s role.

Whether you think that’s a good idea from a design standpoint is another thing. A healer must deal damage or you’re useless

Actually, in OP's case (which is FATEs, or more specifically boss FATEs), a healer spamming high potency AoE healing will contribute more to the party, and increasing the likelihood of said party obtaining the gold reward. This is because boss FATEs are based on enmity generated on the target, rather than the amount of damage dealt to it.

To the OP: The way the FATE credit system works is that it doesn't detect your personal participation until you've actually caused damage to the mob. Changing this would likely require them to rework how FATEs detect participation from non-damage actions without an initial attack. Since the solution is rather easy, by simply throwing out an Aero at any point in the fight, I can't really see them spending resources on this.