(a) aircraft are not perfect machines.
(b) pilots need to stay within the boundaries of the design (and underlying design standards) - this consideration was at play with this accident
(c) given that pilots (generally) have little knowledge of the design standards, there is a need for both operator and pilot to be cautious, careful, and considerate .. lest misplaced enthusiasm smite them. In a nutshell, unless one knows why the OEM says "do this" or "don't do this" then it is a wise man who follows the guidance ...