No andrewr, there are not ‘many, many similar VFR operations happening all the time’
This was in relation to my question: would you announce flying an orbit around Joe's house at 1000 AGL on area, which you replied "Yes, of course".
There are many VFR operations flying around at essentially random routes, maybe making an orbit of a the occasional house, interesting hill or lake etc. They do not tend to broadcast anything on area.
So the question is: what is different about landing in a paddock that requires a broadcast on area, while circling around a house, hill, lake or other interesting feature does not?
My answer is that there may be multiple aircraft operating to the same paddock e.g. Joe has a BBQ or spot landing competition with a few mates, in which case you want to coordinate between the aircraft flying to the same place. This is what the 126.7 frequency is provided for - to coordinate between aircraft flying in to a location where a discrete CTAF is not provided.
Nobody wants Joe's spot landing competition on area.
AIP appears to support this interpretation - although as pointed out, the CAAP has a different interpretation.