The way people use win rates really confuses me

When had her silence, she had 45% win rate. What did people say? Win rates dont matter! She needs nerf!

So silence removed, her win rate dropped to 43% win rate (2% lower, what a gutting!). What did people say? LB same win rate as Urgot, she needs buff!

So got buffs to her mana cost, clone, and W, now she has 47% win rate. What do people say? You guessed it! Win rates dont matter! She needs nerf!

Same thing happened with and way back in S2 and S3. All of them had people crying for nerfs when they had 45% win rate. Each of them was nerfed to below 45% and people immediately began complaining about them being underpowered, despite their win rate being was only 2% lower. We are now demanding nerfs for and , who both have 45 - 46% win rates. Anyone who defends them using win rates is downvoted viciously. If they are ever nerfed to ~43% win rate (Unlikely since Riot loves these two), I bet people will start to say say they are underpowered two weeks later.

Somehow it seems like 45% is arbitrarily defined as the lowest win rate a champion can have while being considered OP, and if the champion so far as venture 1% below that line, he goes from God Tier -> Trash Tier.