Again you're on the mark with your sage advice. I must qualify what I wrote earlier.
The instructions given to us was for police service firearms. I suppose the lawyers of the manufacturers insist that the instructors provide this information so as to ensure that they (the manufacturer) will be less likely to be named as a co-defendant in a wrongful death lawsuit. Almost all major factory schools tell us to keep it at factory specs.
I don't doubt what you've said is true, but once we receive our marching orders, we obey (blindly like a Lacedaemonian). Otherwise, no deep pocket.