The ATSB should be able to tell us if the current accident trend is a statistical “blip” of no significance or an actual change in pilot behavior. The ATSB has long term records of all this stuff, don’t they? There should also be FAA/NTSB comparative data as well.
I note that the U.S. AOPA has a few videos out on weather related decision making. They make the point early that there is a big skill difference between reading a TAF or Two for a local flight and forming a valid mental picture of the weather to be encountered over say a Four hundred mile flight. I don’t think we test for the latter, at least at PPL / RAA level.
An RV (?) can take you a long way into a new weather environment in a few hours.