No, I insist it's fine. If WAR can solo everything in the roulette synched then 4-8 BLUs can clear it, even without Mimicry.

Also you can edit your spellbook inside instances. Just not during combat.

The real reason we can't easily have this is because BLU doesn't play nice with level sync. All of its skills are level 1 and weapon stats don't matter. SQEX has no way (yet) of designing a roulette that can handle BLU's flexibility.

Current roulette technology might give me a SHB dungeon but a teammate who is level 80 in full poetics with nothing but Water Cannon unlocked. I could sit here and try to design solutions to this problem. But if the devs want this roulette to exist, then they'll solve it, and I'll like it.