I kind of wish either that Despair had a 2.8s cast or even that F4/B4 had 3.0s casts so that optimal use of Triplecast was a little more flexible.

Aside from that, I want to see more fire/ice symmetry, especially with AoEs:

Fire2 and Blizzard2 are both targeted, 80 potency AoEs with 2.5s cast times and 800mp casting costs. A late-game trait makes them grant three stacks of their respective buff on hit, just like F3/B3, so B2 becomes the go-to way to recover stacks post-death or after some other loss while F3 shifts to fire mode during your AoE rotation.

Meanwhile, Freeze gets a 4.0s base cast time like Flare so spamming it isn’t attractive.