The most immediate change they can make to SMN is make so aetherflow stacks cannot be 'wasted'. If you Bane a mob but it does not reach the 2nd target because the OT didn't move him close enough should reward a aethertrail regardless. Same with using Fester on a mob that just went invincible on the last second.

Losing the effect of the spell should be punishment enough, having your whole rotation pushed back 2 minutes on top of that is too much.

If you are about to type any reply in the vein of 'git gud' please tell me how a RDM or BLM get punished with the same severity for misusing a spell.