Except that, in my experience, pilots sometimes don't have much, if any, knowledge of system failure analysis, FMECA, and certification standards, generally.
Hence, I might be of the view that routine line use of QRH/MEL is fine for single failures but fraught with problems with multiple failures. This might especially be so where crew knowledge is limited ... not saying that this applies universally .. but certainly one cannot presume that crews have an appropriate level of knowledge .. and "appropriate" goes far beyond a typical pilot engineering endorsement and simulator training.