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In my team: most Individuals keep notifications off except for @ messages and DMs : in both Slack and MS Teams. And everyone uses DM & @ carefully.

DND status is also used when needed.

Emails are for detailed and non-urgent info.

Thanks. From context I'm guessing that you exist in a wider organisation, and Slack was a pre-made decision that you have adapted to?

(And I like your approaches for doing that)

Yes and Yes :)