Why nerfing Zac won't work

I see a lot of people crying for nerfs on Zac. For context, I played a lot of zac prior to his update and now I don't really enjoy him. So I have some idea of what I am talking about.

See the problem with Zac is not his numbers or his tankiness.

It's his Q and R. The basic design of these two abilities mixed with his E create a toxic gameplay pattern where even mistakes can easily be forgiven. If we nerf his numbers, we'll start making him trash, but even then, the basic design behind these two abilities are partially unbalancable. His kit used to be fine in design, but now, now I believe Zac will never be in a balance state that keeps the best parts of his kit in one piece.