I don't think SE understands why people loved Summons in Final Fantasy anymore.

Let's dumb it down, they were big flashy spells and it was always exciting to get more of them even though there were generally a lot throughout the game.

I don't see why an extremely bursty-Type Mage would be that hard to implement. A Mage that builds up it's own mini-limit break bar that gets released like once per trash encounter/periodically throughout a boss fight sounds fun to me. No need to have Summons stay out, no need have "Egis" (which don't look intimidating at all like in FFXI... They look like glorified pixies). Give the real-deal model (slightly shrinked down but still big and intimidating) that comes out, does a flashy attack, then leaves. And give us many of these summons since you can balance the summons around a single attack as opposed to being left.