My simple view on this is that at least as far as healers are concerned, the job design team have been making healers for a game that simply doesn't exist anymore. The disconnect between the job and content designers is just bizarre at this stage.
With some very simple adjustments to cool down timers and the addition of a tank heal, a Dancer could comfortably heal a group through most casual content up until Extremes and frankly, it'd be more enjoyable than a real healer IMHO.