Following Nasrin: I'm done with AST too

[Fendred]

Well, speaking from years of experience, there is no such thing as a good hybrid in the Tank, healer, and damage dealer trinity. Damage can't be hybridized because any hybridization comes at the cost of damage, so DPS checks become a problem. Healing is in a similar boat, since it is just the opposite of damage. The roles would have to be very different to handle hybridization, which is why the trinity from WoW is not a good match for Final Fantasy with its never ending rainbow of jobs.

[Nihility]

Well, speaking from years of experience, there is no such thing as a good hybrid in the Tank, healer, and damage dealer trinity. Damage can't be hybridized because any hybridization comes at the cost of damage, so DPS checks become a problem. Healing is in a similar boat, since it is just the opposite of damage. The roles would have to be very different to handle hybridization, which is why the trinity from WoW is not a good match for Final Fantasy with its never ending rainbow of jobs.

I have seen games with tanks that hold aggro from shouts and auras that buff and debuff instead of straight damage>aggro conversion work very nicely
I have also seen games with dps that have purposely weak output but buff/debuff through it that it ends up being a net gain for the group and desirable to bring one

It is very possible to do.
I have also seen the games with all sorts of healers from the rune buffs to the vampire style heal through damage to the need to keep lots of small HoTs constantly rolling with straight heals being cooldowns.

Astrologian really isn't a hybrid anything though. It is a healer that basically has a watered down white mage loadout
with an out of combat toggle that gives them an inferior regen, medica II, and asylum
or an inferior adloquiem, succor, and sacred soil

and if you think about it what exactly is gained over either other healer in the stances?
A White mage can cast stoneskin in a global cooldown for a better shield than nocturnal aspected benefic while having better regens than a diurnal aspect
a scholar's fairy is basically the ultimate regen spell while having way better shields than a nocturnal aspect
then they lose all the reliable utility and have the weakest damage output in exchange for the card system which feels like it is possibly weaker than selene's haste buff even if you assume nonstop perfect card draws

The solutions seem very clear to me. The card buffs need to be no contest clearly superior to any other classes utility to be worth the randomness
the stances need to be equally strong to other healers and feel different than just weaker version of corresponding class

my personal feeling is the only one that achieves that at all is diurnal benefic, granted it is pretty flawed compared to a standard regen but it's trying at least