I would have thought that this would be blatantly obvious. Players will follow the rules, to the letter of the law. If you say that chat is enforced with all these restrictions, then no meaningful conversation will happen through chat. But that's not the only alternative that players have to communicate with each other. Remember when they banned typing completely in PvP because players were 'too toxic'? Good Job! Good Job! You'll still be excluded for underperforming, but you just won't know why. "B-but you said that I did a good job! Why did the group disband?"