I've been wondering a while about this question.
Haven't played Azir much. He's too complicated for me. But I've seen others play him. From his playstyle, he's very unique.
So, people don't take him to toplane, just like they did with Ryze or Cass after Conqueror changes?
He has good range, very good poke, defensive tools to zone out the incoming bruiser or a jungler. Plus he can safely farm due to his soldiers if necessary, on top of being a ranged champion.
Would like to hear your opinions on this topic.