I don't want to get too into it as I've got sleeping to do. But to answer your question about what other DPS jobs have support skills that lower their DPS?

I will point out an obvious one since I recently switched to SMN main. Battle res lowers SMN DPS. In an extended fight you may be forced to use more energy drains instead of fester if you need to res. And if you don't have swiftcast up for it that is another major DPS loss.

We done yet? Every DPS job has support skills.