I honestly just want to see at least one extremely different control system, so to speak. I want a healer that doesn't just have a discrete button for almost every function (no, the 4-way doubling of Eukresia is not sufficient).

For instance, I'd like SGE to feel more like I'm managing nouliths, not just casting noulith-skinned spells. Let me program and command my little goddamn gundam army.

Build out in-universe-physics ways of giving reason to apply different modes or formation or such, and build out the kit from there, rather than from any template.

After that, I'd probably head to WHM, then AST, then finally SCH, until they each actually feel truly different from one another.