Without trying to speedrun it, I finished all of the BLU content in the first 3 days, achievements and all.

Is this it? Is this all BLU is? Sure they said they're gonna add new spells and Carnival stages, maybe the new spells are what break BLU, but in that case why not include them in the base spell selection? A small part of me hopes, wishes, that they released BLU in its current state to see if players would be happy with it or not, and then will make adjustments to make the job unlimited by the time of Shadowbringers.

But I know it isn't going to happen. They've made this strange bed, and they're gonna keep laying in it, regardless of what we want. It comes off as a "You'll enjoy what we make" sort of attitude.
BLU is Solo "because we said so".
BLU is overpowered "because we said so".
We can't balance BLU "because we said so".
BLU can't play on the roulette "because we said so".

None of the reasons given actually hold up, it all boils down to "because we said so".