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

[SomnusNemoris]

I may not like blm playstyle much, but I just have a feeling that kind of rotation is not ideal. Relying on a proc with 40% chance just save some mp bothers me for some reason. Wouldn't just casting fire 3 till you have to switch to blizz 3 and thunders net a more constant dps with a higher average over hoping you get a firestarter? Idk, I never liked blm and only leveled it for swiftcast so don't take me for an authority on it.

I have always had a certain distrust toward people who can not grasp the simple concept of Black Mage. If you have a feeling about that rotation not being ideal, I think it is time from now on to once more, evaluate your own opinions, not only on this matter, but also on all the things you said all over this thread. SMN utility isn't great, at all. The argument still stands that it is not unique purely situational (only benefit when other people are either incompetent or dead).
I also don't buy what the guy said about only having a 20DPS increase from HA do DW weapon. If I am not mistaken, SMN damge scales a bit higher than BLM? On my BLM it was around + 40DPS, maybe even more. Although the scaling in comparison to melee is pathetic. Melee always seem to benefit a lot more from getting extra WD, since the beginning of this game.