Props to you for coming up with interesting ideas. Although, with the way FFXIV's systems work, I don't believe it will be practical in execution. What you are describing sounds more like Quicktime events where you interact with the battle via rapid-fire or button press sequences and are very cinematic. That, or it could be an idea for a brand-new game all together. But FFXIV relies on either keyboard engagement, mouse clicks (or both) or a controller's Cross-Hotbar. So your idea would need to work for all of those. In addition, I don't believe it would quite work due to people's attentiveness: Not only would you need to remember which skills would mandate the long button presses (and other possible unique button-press styles), but you need to keep an eye on the more difficult boss fights in the game... sometimes, too much is happening on-screen that it's just easier to simply press a button once to execute the action that you need instead of focusing on the style of unique button press. To segue to my next point, your stylized idea for airtime animation is cool (I'll give you that), but it might cause big problems for you and your teammates during intense fights where you must have high-reaction time--if you're floating in the air like a feather and an AOE attack appears beneath your character, you could be screwed.

I'm not attacking your idea, I'm just both trying to understand it and help you refine its execution, because FFXIV's battle systems work in a very specific way... so your ideas would need to focus around that.

Also, your Aetheryte Beam and Energy Blast attacks sound identical. When you say "fire button," are you referring to using the same fire button for each attack? FFXIV doesn't have a fire button, so I'm confused if you mean an ability you assign to a hotbar??

As I said, I'm literally just trying to comprehend it all. You may want to refine & flesh out the idea some more. Think of more abilities. What defensive abilities does the Job have? Any support abilities? Healing abilities? AOE attacks ("Energy Blast" maybe)?