Please honestly tell me what purpose or benefit the all-chat can bring you? And don't talk to me about seeing who is tilted on the opposite team and such bullshit. Usually what you need to do, and you are not mastermind of the universe stop fooling yourself, is to focus on your gameplay, and what all-chat can do is tilt you and turn your attention away from your own play.
So please try it. Tell me about the experience.