[Wombat]

I am concerned that there is one subject missing from consideration: that is the role potentially played by the aircrafts EFIS system. The report states the aircraft was fitted with a Dynon HDX and autopilot. This system is capable in experienced and qualified hands of providing IFR flight control when coupled to a suitable GNSS system.

This system represents both an increased safety benefit and a temptation. It can potentially get you out of trouble by flying in instrument conditions for you. However it represents a temptation to enter instrument conditions when you are not qualified. Bar chatter indicates that some people experiment with  this "claytons IFR" and get away with it. If you were to try this, then if the system fails or you push the wrong button in IFR conditions and accidentally disconnect then you are done for.