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Because most of it automates the wrong half. Sending more email faster is not the bottleneck; knowing which customer needs attention is.
And automation that touches the customer directly is where it goes wrong publicly — a sequence that keeps firing after somebody replied makes you look like you are not reading.
Internal mechanics: routing leads by rule so nothing sits unowned, creating follow-up tasks when a stage changes, flagging deals nobody has touched, opening the project on close.
None of these are visible to a customer, and all of them remove work people currently do badly.
Always, and on any meeting booked.
Yes — routing by rule is one of the safest automations.
Yes, on stage change, so follow-up is never remembered.
Half an hour with your own data usually saves reading three of these. The guides will still be here afterwards.