but we cant work with demonstrated
Demonstration is somewhat the aviation equivalent of the old cartographers' "Here Be Dragons". We don't
know what happens above that value, so we can't say it's horrible, but we (as OEMs) sure aren't going to encourage people to go be test pilots with 100 souls sat in blissful ignorance behind them. So we warn you where we've been, and rather let you draw your own conclusions as to the wisdom of experimentation.