You have demonstrated my point. Medical specialists and other professionals don’t have time to argue the toss with CASA. They Require precision. If the use of GA is a grey area for them, they won’t touch it. All it takes is one CASA guy saying “i’m not sure that’s legal” and the medicos won’t touch it. For example, my stepson is what you might call a “human spare parts salesman” - he supplies surgeons with all sorts of pins, joints, plates, etc. and is present in operating theatres. What if he is in the aircraft with his kit of parts for an operation, with the surgeon?
To put it another way, the level of aviation business risk is just too high in Australia - thanks to CASA
As for RPT definitions, there is a full discussion of what CASA thinks it might mean, sometimes, in the AAT decisions. One involved a few outback stations that decided it was a good idea to organize a fairly regular private milk run. CASA put a stop to that.