Are Swain nerfs justified?

This just came out on PBE:

Swain

Nevermove (W) root duration reduced to 1/1.3/1.5/1.8/2 seconds from 2 at all ranks.

I actually think he should be nerfed even more. As he is most probably the most buffed champion in the history of the game. And those buffs are basically without any reason at all. This guy is too strong even with his supposed weaknesses: grievous wounds, ult heavily drains mana. I mean his W is barely a skillshot. Swain is the Wukong of midlaners: too good for what he does for how little effort he requires to play.