Don't start a post making limitations as for what reasoning people could use.
As far as my opinion, I could give a shit less about win rates unless if it is obviously obvious for a champion to have an extreme win rate. (Skarner 76% win rate.)
He isn't broken, he is just overloaded and is extremely bad design. If you say it is good design, that is like saying "Make a champion with everything in the game crambed into one thing, but make sure one thing in the game is not in that one kit." because that is literally what Thresh is.
Thresh has a 99% slow damaging ultimate that scales with his infinite scalings. Which can be hit multiple times. By the same person or by multiple. In an area of affect. His Q can disengage, engage, peel, pressure just by standing in place like blitz and used to jump walls and more. His e is displacement, a displacement, knock-up slow with a very short cooldown, also used to poke early game and gives all right damage after lanes. His lantern, THIS LANTERN could be literally, one champion as a whole. It does EVERYTHING! Engage, disengage. Shield because why not? Jump a wall for insane mobility, help less mobile champs become mobile. Escape certain death that even the most mobile champs couldn't escape. His kit does EVERYTHING and that is why I despise that TerribleT is getting praise for such a "GOOD KIT."
Oh yeah, by the way his W is AOE. :DDDDDD