For agency owners, what is the deliverable that slipped because it lived in three different tools?

I keep hearing the same story from small agency owners. A client deliverable gets discussed in a Slack thread, then a follow up email, then a line in a project tool, and somehow none of the three has the full picture. Nobody dropped the ball on purpose, the truth was just split across three places.

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For anyone running an agency with a handful of clients, where does the real status of a deliverable live today, Slack, email, a project tool, or mostly in your head until someone asks?