schema.org Action markup - SearchAction, OrderAction, ReserveAction - tells an agent what your site can DO, not just what it says. This is the difference between an agent reading your restaurant page and booking a table.
Impact is importance multiplied by the confidence tier’s weight — SPECIFICATION 1.0, RESEARCH 0.7, EMERGING 0.3, EXPERIMENTAL 0.1. Two rules backed by the same class of evidence therefore always carry the same weight, which is what makes the score reproducible rather than hand-tuned.