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Because verifying a plausible paragraph takes longer than writing three sentences you already knew. Without sources, every draft is a research task.
Replies that require assembling facts from several places — what they bought, what is delivered, what is outstanding, what they last raised. That assembly is the expensive part and it is exactly what a shared record makes cheap.
It helps least on short answers the agent already knows. Do not measure adoption on those.
No, and there is no setting that allows it.
It drafts nothing for that point rather than inventing it.
Not as a target — it rewards sending unchecked drafts.
Half an hour with your own data usually saves reading three of these. The guides will still be here afterwards.