I honestly don't have a good enough grasp of the conjurer class to respond to most of this, but I can offer this insight:

In the past few years there have been very few changes to the conjurer class, and they include:
- Devils were updated a couple of years ago such that they no longer get happier just for casting certain spells, and instead rely primarily on attacking and killing things. (Read: it used to be easier to keep devils happy whilst being lazier.)
- The benefit of various buffs in conjuring elementals was reduced slightly. This would've brought the power ceiling down for a conjurer who had lots of edges and was maximizing various other conditions that impact elemental power. (This should have impacted "really good" conjurers far more than average ones.)

And that's really about it since 2010.

Conjurers are, for the worse in my opinion, one of those classes that is playable without edges but comparatively lacking for anyone who has had the experience of playing one with all the edges. If I was concerned enough and interested enough to make changes, I'd probably increase the strength of conjurers across the board (and make them slightly more forgiving to neutrals) but also lower the ceiling of their power substantially, which may upset more people than it would please. But then I'm not interested in working on that right now so that's all moot.