All those real-time features are antipatterns that do nothing but create anxiety and a false sense of urgency. We use Slack at work, and the typing indicators/presence detection/etc. drive me (and many others) downright insane.

I agree that encryption in transit and rest are important, but there are open and verified solutions like Signal. It seems like extremely poor security hygiene to take Apple's word that their closed-source chat service is actually secure as they claim for it to be.