What Riot collects isn't good enough. Too many variables and the human factor.
What they should do is set up a server where games are played WITHOUT ITEMS.
This way you will get raw data on the win rates of different champions, their KDA etc, so you can first balance the kits. The items are a mess. Its too much chaos and way to hard to measure and quantify. We need a baseline first.
dunder kill6 votesTrying to balance champions without items doesnt make even a tiny bit of sense. Items are a MAJOR variable in the equation.
DarkinPrime1 votesYes, so if in the itemless server a certain champion has a 45% win rate, and then in the real game he has a 54 percent win rate....but yet other champions in that champions class only move a little higher or lower in win rate, you can see which champions benefit the most from items. This info can be used to balance kits and items available
Eedat1 votesso if in the itemless server a certain champion has a 45% win rate, and then in the real game he has a 54 percent win rate
Dude this still makes absolutely zero sense. Why are we going to attempt to balance a champion in an insanely unrealistic scenario? That data proves nothing. Its no secret that certain champs are more item reliant than others. Thats doesn't mean we balance them around not having them.
Jorencice1 votes(Daily darkin comment)
This is idea is bad.
(See ya tommorow)
Nosnide1 votesMakes sense. Its kind of like the bloodmoon event. You only play assassin and suddenly you see which assassins are broken. No items or runes or masteries and you can see just baseline champion power.
Handy Sandy 1 votesWithout items? But some champions are item reliant, which is perfectly okay. Such as 
who need a bit of mana to fuction properly. And then there's ADCs.
Dasdi961 votesIf a game mode was reseleased with items disabled bruisers and mages will dominate.