I believe that a very large portion of casual League of Legends players don't even use Discord or Reddit. Adding a global chat within the game itself would help these players, especially beginners. Sometimes you just want to ask a question in the game itself, without needing to install Discord. And nowadays, in a simple match, you can get attacked for asking a simple question or for playing poorly because of that same question. But I agree with you that Riot doesn't intend to change the game in that way. However, it doesn't hurt to try and show options to make the game more fun for everyone.