Imo SE should combine DWT, Summon Bahamut, and Rouse into the same cooldown, remove the Aetherflow lockouts and Tri-disaster reset, plus all the random DWT bonuses added in 4.1, then buff Bane a bit and normalize Tri-Bind as the AoE filler spell, then go from there. HW SMN played out a lot better compared to this current iteration, with the sole exception being the timer on Aethertrail back then and the addition of Lucid Dreaming in Stormblood overloading us with mana to dump into Ruin III. Doing that would open up the ability to make DWT and Demi-Bahamut far more interesting and allow SE to actually add a real filler rotation that could integrate the Egi into it, though I'd also like to see a trait enhancing their Aetherflow abilities during DWT/Bahamut as well to make it clearer to people that's when you want to use it.

Above all else though, make Manaward a role action or add a personal defensive cooldown already. Sustain is one thing but we take far more damage than our pets do and it'd be nice to have a useful button to help keep ourselves alive like every other class has. Physick heals for less than an in-combat natural HP regen tick now.