Agreed 100%. It's certainly what has chilled my search for the replacement aircraft. Mating the exp with a lyco puts me right back into the captive audience morass I'm trying to get away from.
Problem is most of the auto conversions I see are going into low hp STOLbro ships, and generally compete with the rotax power output. My needs are 160hp-180hp SL continuous, haven't seen much of that in the auto space and certainly zero in the rotax (latter where the pricing is quickly making it moot as an alternative anyways). Other than insane LS1 long blocks that make the airplane useless as an actual acro/cruiser, it's crickets.
The old Subaru guy now selling Hondas is the only game in town (viking), but people on here hate him because his subbie venture presumably ripped some people off, so the presumption is the hondas are snake oil too. Thing is, at the prices they're asking, I'm willing to gamble. Problem is I have yet seen a completion on an RV for the viking engines in my desired HP range. If I had the time, I'd love to tackle the cowl/firewall/radiator work to get me to the promised land, even if I have to swap PRSUs like they're brake pads. Anything is better at this point than the nonsense you're currently putting up with, all due respect.
As to the aspersion of non-aviation mechanics putting their hands on your airplane mill, I hear ya... kinda. Again, I know you're putting your money where your mouth is, but I'm not speaking from the cheap seats either, it could have been my family on board when "it" happened to me. That wasn't a homebrew, that was a cErTiFiEd. So you'll excuse me if I cut auto engine wrenchheads some slack.
To quote Jay from 40-year old virgin: