What if the following skills became instacast with a slight delay and tell (0.5s) before doing damage:
Basically after this proposed idea, the following skills will flash a certain double set of color (Plasma Burst is Fire/Air, so it will flash purple and orange, for 0.5s, etc.) to notify the enemy when the attack approaches.
Why? Well this will allow for potent combos that will surely allow for more damage/utility potential. You can cast these while using any of the evade skills. You can even cast them while using Twist of Fate.
I think this would be the change to make D/D a thing in all 3 game modes. It's simple but very effective. You can even one-shot an enemy by precasting Glyph of Elemental Power (Fire), Fire Grab, and Ashen Blast or Plasma Burst, then using Lightning Flash and Arcane Blast simultaneously and double attuning (or single attuning if using Plasma Burst) into Air attunement.
Hopefully this gets considered as it can make D/D viable and a more offensive option than Sw/D.