The main reason our aircraft avgas piston engines have not developed into a modern, computer managed, direct fuel injection system, is the lawyers destroyed the U.S. light aircraft industry in the 1970’s.
Frivolous litigation, by the ambulance chasing lawyers, sent the manufacturers into bankruptcy, where at one point liability insurance was 50% of aircraft manufacturing cost. The lawyers saw aviation as a cash cow, and single handedly kept development in the dark ages. The motor car industry had deeper pockets,
Even Porsche, with all it’s technical support, was unable to make its aircraft engine successful, in the 1990’s.