Yeah, pretty sure it's only a WHM thing. I think it's because too many WHM get Regen/Medica II happy.

Actually had a WHM casting Medica II before/during Heart phase on Titan, and couldn't figure out why he was pulling so much threat. It was pretty much every geocrusher/tumult he was casting Medica II, like even when it was only 1-3 stomps and we were already shielded with Succor and Sacred Soil.

I've also seen a lot of WHM spamming Cure II and III while also doing Medica and Medica II during CM runs.

On side note, since this is about aggro. I've never seen any class run around more when they get hate than WHMs. Last fight in CM (when she summons the adds to one targeted person), almost every WHM I've seen seems to not understand that they can simply run to the boss and spam heals on themselves. I think we need to get the knowledge out that it's much easier to run to the tank than to run around like an idiot.