What they should have done with fairies:

[Sorzai]

I wouldn't mind merging the Tactical Approach with the Faerie.

I liked FFXI's Scholar's sytem: Where you had a Black Grimmoire and a White Grimmoire. Two stances that would increase debuffs and elemental offensive magic or buffs and healing magic.

We had two fairies that could have become "living" embodiements of the two grimmoire system, Grimmoire of Dusk for Selene, and Grimmoire of Dawn for Eos.

Switching from one to the other, juggling Debuffing and Healing could have made for a very fun interactive system.
It would have probably made SCH very powerful too, versatility being a very valuable asset.

I like the concept, especially because in lore the faeries are playful like we saw in shb, though I don't think they're the same types of faeries.

I always enjoyed having to stance dance, like back when WHM had cleric stance, with monk now having fist of fire/wind/earth. If they were able to do something like you mentioned that would be pretty cool.

Though i would prefer if they remove the faerie as a pet altogether, I find it rather ridiculous having a pet cast the spells instead of the scholar. I mean I'm a freaking scholar, they read books for a living. Scholars should be able to learn how to cast these spells themselves.
Let me be able to transform into a big ass faerie, like the faerie queen lol