I promise nobody thinks about Balance, people just want something new for a Job role that only has 3 Options. Vs the DPS role that has like...8.
People just like the idea of an Ast with Dance Moves instead of a Draw system, which is pretty much what a Dancer Healer would have been. So to everyone who reads this.....as much as I too would have loved Dancer as a Healer.....its not realistic, it would just step on the shoes of an Already made Healer, and do the same thing.