About the possibility of voice chat
Ok, we have this article claiming that Riot is thinking about implementing it: https://www.pcgamesn.com/league-of-legends/lol-voice-chat
> The news comes from a reply in a Q&A session by Riot Korea, which was translated and posted to Reddit by user Calycae:
>
> “In-game voice chat is currently being internally reviewed.
Just one thing, it goes without saying, but we all know Riot sometimes seriously lacks common sense. If they're going to actually make voice chat a thing I truly hope they make sure it comes with a mute button right from the start. The amount of new toxicity that will bring will be no joke. Voice chat will add a new reason for many to tilt or rage and be toxic: bad English or hard to understand accents. I can already see the new rage-inducing reasons,''your English is fucking shit'', ''learn to pronounce, you trash'', ''speak English, you moron!'', this will cause so many problems.
While I can certainly see the POTENTIAL use of voice chat for better coordination, knowing how this community is, it wouldn't surprise me if it makes games worse than they are in the toxicity department.
TL;DR: Don't forget to add a mute button if the voice chat feature goes through.