Understand.

I didn't want to write on and on and on but at one time, Rotax were seen as inferior to the normalcy of aircraft engines. Now they are the gold standard and they charge accordingly.

Still today, there are pilots who wish nothing to do with a Rotax engine. Flip side if you can write the check, Rotax needs roughly $55K for an installed 915iS (requires a certain panel constraints and a constant speed propeller which add $$$$$$$$$$$$$$$$$$$)

The VW, as I mentioned was an attempt to not pay for a certified engine. There has been a history both good and bad with these engines and thus the results from an insurance companies willingness to insure the aircraft, however, they are not the arguments that everyone uses for a certified engine as the argument is from a manufacture's POV in regards to the trios amigos. (Attorney, Insurance & Liability) Your argument is for hull insurance not engine insurance issue from a manufacturer's POV.