Agrajag.
Did the manufacturer of your aircraft tell you that they had made the POH vague for that reason or is it an assumption on your part.
If they had to put in everything, you would have a POH that you couldn't carry due to the weight limitations of your aircraft.
Yes, I do agree times have changed, instrumentation has advanced but you can't just make stuff up to suit what you believe without approval from either the authority or the manufacturer.
Just cos it's not in there doesn't mean all bets are off.
Unrelated to aviation but there was a case in the states whereby a new owner of a Winnebago turned on his cruise control and proceeded to go down the back and make a cuppa which then resulted in a crash and lawsuit.
He won cos it wasnt written in the handbook not to do that.
I'm not saying we are in the same situation here but Geeezus.
I bet the handbook for a winnebago is now more comprehensive.