[onion2k]

Sending a message in a public channel is psychologically akin to walking into a room full of people and just loudly proclaiming/demanding help.

Only if that room enables people to only hear shouts that include their name, where they can pause hearing shouts, where it's acceptable to ignore shouts if you're busy, and where there's someone recording the shouts in case someone has a similar problem later.

In fact, in almost all the ways that matter it's entirely different to shouting in a room.