Champion Balance: 100+ Games Win Rate

I found out while looking at champion.gg that there are two champion that have ridiculous winrates when you put 100 games in. Both of these champions were considered "gutted" which obviously must not be the case if people can do this. One of these is considered a joke. Take a guess at which champions i'm describing.

Kalista, who is considered one of the weakest champion in the game and is going to get buffed, has a 70% winrate for over 100 games played. Think about that guys. If you invest time into this trash tier champion, you can win almost 70% of your games. Right now you're wondering why I was looking at this, and to confirm your suspicions by saying it's because me, as a 6000 health 200 armor cho'gath, got killed by one in under 5 seconds because she had lord doms.

Taliyah I just stumbled over looking into kalista. If you thought the win rate for kalista was ridiculous, but Taliyah has a fucking 80% winrate with over 100 games played. You could essentially put 100 games into taliyah and get to challenger just by solo carrying every game. This is even more surprising after the "gutting" that "occurred" and she's still this strong.

The point of this post is that there have been champions nerfed for less in the pass. People that were good with azir or gangplank, experienced players that had 100 games, were getting winrates in the 60's when they were nerfed. Gangplank is still fine though because he is gangplank but we all know how weak azir is right now. My point is that those to champions don't need buffs. If people WANT to play kalista, then just play a shit ton of her and enjoy the freelo. Same with taliyah. You want to know what azir and gangplanks winrates look like? 100+ game azir players have a 50% and gangplank has a 55%. They don't even come close. But it's not just them. Experienced players with multiple, dozens of champions usually are anywhere from 50% - 60%.

Doesn't this seem like it might be a problem?