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Because they arrive as a single number with an adjustment applied by somebody's judgement. When it misses, nobody can separate optimistic deals from a genuine market change.
So the same conversation happens next quarter, and the forecast gradually becomes a negotiation rather than an estimate.
Show weighted and unweighted side by side, always. The gap between them is the conversation.
Make the stage weights visible and derived from your own history. Then any figure drills to the deals behind it, so a challenge is answered by opening the list rather than defending the method.
Both, always. Either alone misleads.
No — weights come from history. Reps set the stage and the date.
Weekly on exceptions, monthly on the whole pipeline.
Half an hour with your own data usually saves reading three of these. The guides will still be here afterwards.