.. that appears like we are in general agreement on philosophy .. however, we probably need to argue the wind thing over a beer or ten ... as we will need to do in regard to FAR 25 and CAO 20.7.1B .. unfortunately one of the longstanding Australian Regulatory failings has been inadequate complementary regulatory processes of design standard and operating standard .. it is my view that the US does it far better. Now, if the FAA and EASA could just get their collective acts together ...
I am a tad confused at your comment re FAR .. obviously, if the basic data is not slope, the technique is irrelevant .. but it must surely be applicable for any slope-based data situation ...
While I hold most of the CASA folk in good esteem .. it is necessary to keep in mind that the number of folk with any serious performance background one numbers on the fingers of one hand, I suggest .. however, I would opine that there is naught the matter with fruit salads ..