Compulsion , many of the points you raise are valid , however irrespective of what engine you fly behind , always be mindful of the potential of an engine failure and fly accordingly . Much , mainly well intentioned , comment has been said on these forums regarding Jabiru engines , some from authoratitive sources , some not . Whatever the engine , familiarise yourself with its operation and learn to detect any departure from normal operation. A 'one pilot/owner' should learn to detect any change from normal operation fairly early and act accordingly ,opposed to an aircraft in say a flying school , used by many different pilots with no real " ownership" of the aircraft .Ensure the maintenance is carried out regularly by someone really familiar with the engine . I find that some owner/maintainers are excellent , others not so , and the same applies to licensed maintainers .
Bob