Geffers,
You said, "I would like to visit with the design teams for any new western helicopter carrying a flight bag - say 20kg - full of metal and say to them "There you are please put 20 kgs of metal back in your helicopter where you think it will do most good". "
Good on ya, that is almost exactly what I tried to do daily in Sikorsky! One of the reasons why I post the thoughts about "too much power" is just because the weight wasted on unecessary power (yes, there is a max threshold!) robs payload that could be used to add safety!