I see where you’re coming from so let me provide a little context. I’ll be sure to go back and read the audience building blog post again—but last time I scanned over it I don’t remember seeing this kind of use case covered.
Imagine you’re a health guru. You have a large audience who’s pinging you constantly through WA, LINE, Messenger, Telegram, and SMS asking the same questions over and over. You’ve decided to use Discourse to start disseminating information and are considering centering more of your time there for private comms.
You ask your users to send you a message on Discourse. They get there and quickly become stumped because it’s not clear they need to Log In before sending you a private message.