JAR or Bust appearsto be the mind set of a faction within CASA. Unable to determine if it is the ex-military group or the expats from the mother land.
The JAR is a set of core regulations that member bodies (some 35 of them) are free to make their own interpretation of when incorporating them into their native legislation.
Once incorporated they are "JAR" compliant legislation, but with a national flavour. Is this a franchise ?
JAR does not acknowledge that the birthplaces of commercial aviation, (USA, Australia, Canada etc) might already have sound and proven aviation regulation.
One only has to look at traditionally bureacratic countries such as UK and Germany to see what fun they are having ignoring the outside world and generating their flavour of JAR.
The US FAR's are fairly well thought out and not subject to frequent amendment because they probably have got it right by now.
Most JAR countries tend only to have an Airline perspective because geographically they have no requirement for general aviation ( Charter or business aviation).
Very hard for them to grasp the wilderness or vastness of Canada and Alaska, Australia and South Africa, even the USA.
The tyranny of distance and the lack of other transport opportunities has dictated a strong aviation growth outside of the Airline industry.
What suits tiny European countries does not necessarily fit with the needs of vast countries dependant on all modes of aviation.
Australia needs to carefully assess whether or not to buy a JAR franchise in light of it's actual needs.