A popular vehicle finally sells after weeks on the lot. Several leads had asked about that exact vehicle over the past month.
Those leads have been shopping elsewhere. If they don't know the vehicle is gone, they keep mentally holding that option — and eventually buy a similar one from a competitor.
Lead Auto-Notify fires within a minute of the sold status change. Each interested lead gets a personalized message: the vehicle just sold, but here are similar alternatives still on the lot.
Multiple leads reply the same evening. One books a weekend test drive on an alternative and signs that day. The 'just sold' message created the urgency that moved them off the fence.