What?In GW1, necros and elementalists were not healers.What?They are in GW2, because primary healers are no longer in the game.
What?Keep in mind that every profession has a profession-unique mechanic. This should serve as enough counter-argument to everyone who says "no hexes in GW2" and "no edenial in GW2".
Except that, there are no hexes.But there's nothing to stop the mesmer from having a few hexes.
What?In fact, other professions have hexes already (they're just not called hexes).