If it was balanced to a point where the PLD was practicially self sufficient and it would allow the healer to DPS it might not be so bad.
But it opens a different can of worms in that your potential DPS contribution is now solely in the hands of the healer.
Now it's up to the healer to decide if they want to be as they would say: "a dps with some healing responsibilities"
or they want to live to only heal because "they're a healer."
You get problems where a PLD is now probably stuck in a dungeon with a healer with his/her thumb up their {rear} watching netflix or something and all the PLD can do is make damage non existent and hope atleast the other two DPS are confident because his contributions are being squandered by the 'healer'.
Or the whole solo tank shish kebob that was prevalent in SCoB where one of the tank slots was replaced by a DPS because the main tank could handle everything. Devalueing tanks and making them feel less needed then they should.
