My ex works in insurance, while she was drafting new and reviewing existing policy docs she asked me to edit them for her. The feedback she got on the edited versions when she resubmitted them was "Thank your husband for the excellent work he has done but unfortunately we can't use them. By correcting the grammar, and in particular the punctuation he has introduced, he has removed the built in ambiguity." That has stuck with me for decades (would have been mid '90s).