What well engineered are we talking about?
The fact that Continental is offering a carburetor O-200 for the new Skycatcher 162 should forever disqualify them from being in that bracket - which car manufacturer has carburetted engines in this day and age? A company willing to appear on or at the very forefront of development would have yanked that offering 15 years ago... It's a joke.
I understand the reliability issues with well proven aviation engines. So did everyone else in Detroit 60 years ago when they knew the longevity and reliability of an engine is down to low compression output from huge displacement. It's really not rocket science. That doesn't mean we should have to tolerate carburetor, carb ice rings and old school magnetos (that break time and time again) when there are clearly both proven and reliable alternatives. Just call Bosch up and they'll be able to send you not only electronic ignition and injection, but even fadec.