Hey Aurora Aura,

The important point is the cast time. The low cast time gives you a shout window to reave some skill and open up ways to heal. You CAN make use of it. I give some esampels for that:

WHM : vita + teragram. = 1150 heal in one gdc with 400 mana only (But, thats only okay if you have no lilli -> inst. skills make a better window)

SCH: physics + illustate = 1000 heal for 400 mana in one gcd

AST: Bene I + dignitiy = 800 - 1500 heal for 400 mana in one gcd

The thinking here is that you do not clip here. That can clip with the stronger heals (Bene II, Vita II, sch has nothing that we can compear). So If you realy want to use a GCD heal AND and you can combo it with talents (OGCD). The low ranks from this healer skills are strong because the way not to clip.

That is ony way to heal. Like someone here say the most of the player do not want to use GCDheal and for this Playbase it count as mistake, but SE want give every player the way to play there Healerjob. So I would say there is no worng or bad as long nobody is dead.