/dev diary: Ghostcrawler on Successful Champs

I think there is a problem that is kind of recurring and yet covered by none of the pillar, so I want to draw attention on that:

Some champs are impossible to balance for a variety of MMR. Azir, Kalista, Ryze, etc. That's a bad thing, but that doesn't contradict any of the "Pillars". In fact, it's due to a very high "Skill expressiveness", at least on the mechanics/dexterity side of things, so they probably score even higher on the Pillars DUE to that problem.

So, Ghostcrawler, do you have anything planned to solve this issue, or do you think it's not a problem for a "successful" champion?