Rod Stiff doesn't listen
Rod Stiff has been warned many times by highly qualified engineers of the problems with the engine that are easily identified by known mathematical theory such resonance issues within the engine. This stuff is not cutting edge and is common knowledge amongst the fraternity.
Reliability is achieved in engineering by research and development, generally but not always the more money you spend the better the result. The engine was developed on a shoestring budget and it's time to face the fact that a more intensive, expensive solution is required. There is no doubt the engine has evolved and improved but glaring issues still exist.
CASA had to do something and the result is CASA protecting the integrity of the VH rego. Not much has changed if you fly with numbers, but if you want to fly VH, you pay your extra money for the certification regime and the perceived safety that it delivers. CASA has effectively put VH registered Jabiru powered aircraft in the same operating regime as RAA.
In fact it's refreshing that CASA have respected the right of avaitors to kill themselves in a manner in which they see fit, just as long as they don't harm others in the process. I have NO love for CASA but in this case I think they got it about right.