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

[Bigcat9715]

That's what I thought too. Out of all SMN specific spells, they picked the most basic Arcanist spell orz

If they had buff SMN anymore the buff would have just made Sch broken. But according to Yoshida we should be using Ruin 2 and book smacking enemies, so it's time to add book smacking to my rotation. Smh :/