Can someone give me an in-depth explanation why Summoner is arguably the worst DPS?

[Brianmj]

You know what is telling about this thread and all the others concerning Summoner? Game players make horrible game designers. Suggestion are just thrown out with no regard for balance, no regard to how said suggestions would affect player behavior. No regard to how job abilities are played out in other systems (pvp, levemetes, guildhiests etc) You feel Tri-disaster is useless? I use it all the time. It's a very important kiting tool. Just because you have no use for it doesn't mean someone else doesn't.