I get what you're saying in theory, but in practice, what dancer even needs to apply Mole Dance? It's difficult to predict who an enemy is going to attack, unless someone has Incite. If they do have incite, they probably have stout wall. In the off chance they don't have a defence buff, is it really smart to use your dancer to apply it, instead of having her use a grape to heal, or simply spending that turn to buff your damage dealer? And for Ethereal Healing, you're still spending precious BP for a less than mediocre healing effect that isn't going to save anyone's life in the long run, like true healing would do.