psa: winrates arent everything
a champ can have a low playerbase of only people who main that champion, ex 
a champ can have a high playerbase of a lot of people who are starting to play the champion
this may drop the winrate of some champions ex.
(<--- shadow kayn sucks ass) 
the actual strength of a champion relies in their kit, which may or may not be too powerful, stop telling riot to nerf champions depending on their winrate, it's just stupid.