Sorry, was not trying to say he is negative nancy or debbie downer, lol. Though, if you want to make a comparison, AST is somewhat similar to FFXI's SCH. FFXI's SCH has two sects, they can be a healer with emphasize on HoT, or they can be pure magical DPS similar to BLM. It was a bit rough when they introduce this because how powerful SCH come across. At one point, it was killing WHM and BLM spot in a party, since FFXI's SCH can switch stance at will, and have close to the destruction power of BLM and then some unique abilities as well. SE finally made adjustment to WHMs and turned it into the powerhouse healer that eclipse all other healer type in that game. SE knows how to make a great hybrid job, FFXI's Red Mage, Scholar, Blue Mage, Corsair and after long tweaks, Summoner and Puppetmaster.
I am sure given time, a year from now, SE would probably do more tweaks and redefine some of the characteristic of WHM, SCH and AST. And if they bring another healer type in 4.0, they probably have to make a big distinction to the existing three. There are only so many ways you can heal in this game
