Voice chat
I can not see a good argument as to why is there still no voice chat in the game?
Voice chat brings the ability for a player to strategically plan out strategies or power-plays in a matter of seconds. Now we have to type everything out which takes a long time. Also typing in a teamfight would be dumb, but for example if you wanted to shot-call in teamfights in soloQ, you can do it with ease using voicechat.
I really don't get why RIOT does not add voice chat, the time is now, as the game is getting more and more strategic and objectives need a lot of planning, there really is no counter argument.
You could say that the voice chat could be sometimes used for verbal abuse, yes, but that's why there's the mute button. Also, people actually behave better over voice than text.