I used to think the same way, that my SMN was just as good a DD as someone else's actual DD job. Having a parser on hand changed my mind, and then having a WAR leveled made me see the error of my ways.
That's not to say SMN has no place at all in Adoulin. It's a great job for bayld farming in reives, for example. The AOE buffs apply to everyone, even people not in your party, so the support is welcome there.