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

[Xisin]

considering I can already beat my blm with my nin on single target... and we've already all pretty much agreed that smn is UP. then I don't think what you are saying makes sense. As in it's your opinion, and that's fine to have an opinion. Just don't try to get the game balanced on your own perception of difficulty. Seemingly what you want is for smn to pull superior numbers due to you thinking its harder than say NIN, or BLM, or MNK (everything.)