I agree 100%. There were a great deal many very similar accidents involving a graveyard spiral, in-flight breakup due to pilots pulling too hard, etc. in aircraft that did not involve turbine engine.
And I disagree that insurance companies have a line of demarcation at kerosene. John Collins from FLYING who spent his career analyzing GA accidents pointed out a few such demarcation lines but the one that applies here is pressurization.
There is absolutely a clear line. Piston pressurization only raises the premium in dollars per $100K in coverage. Turbine aircraft (which of course includes pressurization) as far as I know requires initial (if it is first time in make and model) and recurrent training with an insurance approved organization. I have never known this to be excepted. That adds $4-5K to the cost of insurance in one fell swoop. This is a clear line of demarcation. When private pilots cross this line insurance companies get as nervous as a whore in Sunday school. I wonder if this pilot even had insurance?