We could mix it a bit, so SE doesn't has to change this setup.
What if...
- a dancer is an indirect healer? (shielding, strong debuffs connected tank<-> boss for example)
- a dancer motivates his group to regenerate HP (LotrO minstrel)
- a dancer can distract enemies
- a dance is a jack of all trades(just kidding!)
- a dancer can strengthen the whole parties attack
He for sure has to be "bad" at other parts.
- lowest HP pool
- mediocre attack value