Conjurers are stupid strong situationally. That should be balanced by them being vulnerable situationally.

You go with familiar/elemental/archon/mercenary - that's like 20% chance of a skill going for archon.
You have flash, which can blind and then archon will never be hit with a skill.

So I'm more of a "There are mobs that can't be blinded? So you can't set up archon keeping you alive forever in like 10% of your fights? We the people don't really mind, think of something to mitigate that, have the assassin tank ghasts and go angel if you're so absolutely sure you should do ghasts."