A lot of what you are saying is logical in the sense that ALL of the players that play PvP (or this game) use logic, unfortunately that isn't the case.. If everyone used logistics rather then going in utterly blinded (be it their job's basics or the game mode), ignoring advice perceving it as insults no matter the manner the advice is given, and/or continuously showering themselves in ignorance even after dozens of games, a lot of these issues wouldn't existence.
The fact of the matter is not everyone uses logic when they encounter certain trials. People can barely tell the difference between any type of criticism and toxicity.
If the only pro of chat disability is less "toxicity" SE is sadly mistaken in that regard.