Azir will be a serious problem
AP Master Yi was allowed to harass without consequences. His lane dominance was insane. Riot didn't want that, hence the complete rework. Cassiopeia was reworked to be more late game oriented. Riot took a huge dump on her poisons because they were to strong in the lane phase. I'm sure you can name other champions Riot toned down due to their huge lane advantage.
Now we have Azir. Minions that can't be target. Azir can get off free harass making lane phase nearly impossible for pretty much anyone you bring into the middle lane. Azir is going to be a serious problem.