Technically it does, just not for anything anyone cares about: Leviathan Extreme. Even with the fact that the Tail reflects back onto you, and only double DoTing when you can Bane onto the Tail (so you just get a single reflect), SMN pretty much destroys any other dps due to this and rolling DoTs while Leviathan was off the boat. If you decide to pain your healer, it gets even more intense. If most/every endgame encounter was set up like Leviathan, SMNs would be shining gods of damage.
The reality is that it seems these days, melee dps wreck everything (particularly MNK+NIN), and it's everyone else who is more severely punished for moving around and whatnot. The less adds there are, the less exciting any kind of caster dps "feels" these days. I'd happily have the roles become more complex (BLM in particular is super easy to play, which makes it even more alarming how many poor BLMs are out there) to have a shot at doing competitive dps on single target. Being a caster (or a WHM!) is pretty amazing dps in Syrcus Tower, but less exciting when dealing with only a single target with minimal or nonexistent adds.
