I believe it was bug boarded that NPC targeting logic didn't follow the same as PC, so now they have to see the target to use a skill on it.

Wouldn't the use of flash mitigate the NPC ability to target the archon?

Or is the real argument I can't rank on things that can't be blinded anymore, like undeads? Since he is using ghasts as his example and ghast ranking is one of the most stupid easy forms of ranking there is.

I've ranked with conjurers post change, they do just fine. Maybe they require a little more attention to play now, and god forbid there be a little risk in ranking, but that's far from making them unplayable.