I think what BEagle was referring to when he said
“pilots should never need to do such a thing in response to QRH directions - which must be clear and unambiguous.”
is documentation should be clear and unambiguous as much as possible, sure it is impossible to get things perfectbut a pilot has enough to learn and figure out without making things more difficult than necessary by providing loose documentation. Technical writers really have a big responsibility and they should have a good understanding of the words and be able to convey concepts clearly and unambiguously.