I think in a game where every second counts, I don't want to be typing stuff in chat. Say I want to coordinate an attack with a random teammate, typing it out is slow and annoying. I think we should have an optional voice chat to communicate with teammates. I understand some players wouldn't want this, so it could be something you have to turn on in the settings.

In the subject of comms I would also suggest the addition of a mute button for text chat as well.

We need better comms options for healthy community, but also to be able to ignore the toxic ones.

This really is a great idea, all it need is a mute function and you're sweet.

Maybe relic is too scared to let people to communicate freely because "gaming experience may change online".

We should also be able to mute players text, cause some people are ***holes

There is a Multitude of Options for VC besides having the team shoehorn a feature. Just my take on it it is too much Money and Time to do this. 

I agree with MrDominicDuffy - there's a decent community in the official discord, all of my multiplayer games (apart from 1v1) have been with voice chat with team mates :)