Zac a little to strong?

There has never been a time when zac has been bad...zac has always been a really good pick. He currently has a 52% winrate and his winrate stays above 50% at every stage of the game hes good early good mid amazing late does tons of damage while tank has cc has engage has disruption. And with strength of the ages coming in he is just even better. He was always mirrored with hec as a god tier pick lately why doesn't zac get some nerfs? Hec still is a contested pick with the tiny tiny nerf he got a while back.