The Zac rework made him more of a problem it feels like.
I loved and highly prefer old Zac, now his ult just seems like it can be TOO good. It honestly seems like he was forced into a niche role with only a few dedicated people who continue to try and make him work.
His jungle clear do to W nerfs early is worse than just about any other tanks clear in speed and hp lost.
His old ult had utility in the knock up and actually did damage, a good flash ult was awesome to pull off. It doesn't feel like he was balanced, it feels like he was changed, then it turned into an "oh shit, we may have made a mistake..." Then he was nerfed into the ground.
Why not Revert ability changes, keep the stupid impact zone circle if you must even and keep looking into options?
Don't force him into obscurity like :

I don't want my teammates to be "christ a zac main gg"
to work with the old animations since they likely just made the skin with the newer ones.
just knockbacked and ran..