If BLU is to remain limited....
Like all the twitter articles with Yoshi P have suggested, then PLEASE make it as OP as you think it is.
Let all bosses be hit by all our spells. And greater acc on those spells as well. We went through the trouble of learning them they shouldn't be such a pain to use since they miss 99% of the time.
No diminishing returns on debuffs. These are core combos to some spells that just can't work because the boss is immune to deep freeze or petrify. Paralyze hardly ever works and eventually doesn't last long at all anyway.
More defense. BLU is supposed to be a "solo" job or at least somewhat of a solo job, yet every time I was in a pure BLU party trying to learn the primal spells the BLU tank was almost getting two or three shot with Mighty Guard on. This was on Hard mode btw.
Stop with the same spell just different AoE patters. I get that the different elements are supposed to used in the Masked Carnival but give the spells some kind of combos or secondary uses. Give me a reason to use Plaincracker over Ram's Voice, Flamethrower over... anything since I never use it.
And Give the weapon some stats.... You are making those Aetheryte earrings able to level with you I see no reason you couldn't do this for all the BLU weapons since they are so few and just for glamour right now.