InEffect: Too much range and no front-line to speak of. At all
RullGog: Thanks for the thoughts. I will make that exact party to have a good baseline to compare to, and continue my quest to find the best all-ranged party I can produce, just to see how it stacks up against that.
Maybe I'll try out 5 kineticist or something and see how I can improve from there. I'll take it from you that at some point the only way forward is to add a melee frontline, but I'd love to see where I end up given the no-melee constraint, and see how far I'll get in relative power level.
Solo kineticist/thug and solo sylvan sorc are doable on unfair, so there's that. Could count as a ranged only party xD
Really, though, the game is beatable with no front-line with enough fodder like pets and summons. It's just going to be tedious as all hell with all the pre-summoning required. I would also concentrate on CC heavily for that one(even more so than for a standard unfair party and that one is not exactly light on CC either).