Common sense. "Duh" yes. But when I see threads claiming it's for balance or changes reasons it's laughable.
If Dancer was a Healer this wouldn't be a thing. No, not complaining actually. I enjoy these queue times. Just tired of the propaganda regarding the queues.
It's basic logic that if you add every other role outside of Healer this situation will happen, especially a fan favorite style of gameplay like a Gunblade referencing Squall from FF8.