My only quip with Bane is 5yalms from hit target... sigh such a tiny area, yes I would love if there as not a cap and yes if the effect cast to uninfected mobs that did not already get hit with prior Bane spread. 3 is kinda silly bit I can live with that, I'm having a hard time living with 5yalm spread. Being at range I often think mobs are close enough and waste a stack of Aetherflow casting bane and it only hits a single target (makes me so frustrated).
I will have to disagree with the Dev stating Garud'a add of time to BIO2 and Miasma up to 30 seconds making bane over powered is a crock of shit. A whole extra 5seconds to BIO2 and 7seconds to Miasma, this does not make overpowered at all. Just helps with being able to set up the next restack of DoTs, nothing more. I don't even think I've seen it affect Bio's timer, if so obviously not enough to matter.

Anyhoo, yes more time spent on SMN being, well, a SUMMONER and less of a mage with a pet (ie. almost beastmaster-esk). Give WAR a pet and guess what you have a BST.
With my SMN I feel we are very gimp in Burst damage, SMN does not put out fast instant damage as other classes and being completely reliant on DoTs and the fact that those DoTs need to stick in order for Bane to be useful or spread at all to other mobs because of the tiny 5yalms of effect. I find myself rarely using Bane now because it sucks so badly, and Fester gets used more often to take down single targets within my Shadowflare (which is only available at lvl50). I rarely run out of Mana with some long drawn out boss fights I get close, when having to recast BIO2 or Miasma cause it didn't stick (loosing DPS at this point). Yes SMN has the ability to still do damage on the run where BLM gets Scathe only.
So with Aetherflow allowing 3 casts of a choice of 3 spells that use Aetherflow stacks limits SMN a lot. So I guess I'm not understanding how anyone thinks SMN is over powered in any fashion? To me its pretty balanced yet could use some kind of Burst damage over Ruin2 which can drain the hell out of your mana pool when trying to Burn the end of a Boss' or mobs' life.