To those saying "Why don't you address the main problem of a champion"
Riot said it before, but they are not removing what defines a champion and makes him strong, they are toning town the other abilities to bring him down. Imagine if they did something to Yasuo's E, he'd be useless, or Kalista's passive, she'd be useless. They address the other abilities and not the main one in order to keep the champion in a better state.
Edit: Think of it like building a new computer, you're probably still gonna keep the good parts, but try to change the bad ones.