The biggest issues that we face:

EPA and their two pronged war against mogas and 100LL.

Torts - Why should the manufacturer be responsible for all crashes of their airplanes? GM isn't responsible if you crash a chevy cruise into a bank. If its not a defect of manufacturing or an issue that was hidden or unknown to the public, I don't see how the manufacturer should be liable.

Certified engines - Too costly. I don't see why an engine designed 60 years ago from basic materials needs to cost more than a brand new car designed 2 years ago.