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> effectively no way to distinguish messages by priority or time-sensitivity

How do you do that with Slack?

Slack messages that notify you (mentions and DMs) should be for time-sensitive things. Obviously that can still be abused, but I think the social expectations are much clearer than when a team uses email for everything.

> but I think the social expectations are much clearer than when a team uses email for everything.

In my experience, this is typically the expectation to respond immediately regardless of the query.

Nope.

Channel -> [gear icon] -> mute

Alternatively:

Channel -> [gear icon] -> Notification Preferences -> Just mentions

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