Sure they do. Crest of Alpha Lupi, Ward of Dawn, and you get free heal + buff. The nature of the game isn't paced to where traditional healing is necessary. Literally, in WoW, City of Heroes, etc. a healer or debuffer was absolutely necessary for success, in many cases. This game has existed since September without such need.
They heal to the extent of what's necessary in this game. Please, tell me how this game has endured for over three months, in every aspect of content, with WoW or GW clerics being unnecessary. If they were necessary, the success rate on -any- content would be severely hampered. That's the real point. No other class can safely res another, apart from Defender. That's a healer.
That's too far of a stretch. You're talking about modifying core mechanics unnecessarily, when there are already options in place that cater to the design of the game.