In the 90s aircraft manufacturers basically stopped whole segments of the market (anything smaller than a piston twin) due to litigation. I wouldn't be horribly surprised to find we spend the next 10 years fighting about this stuff in court.
LLMs have been firing out a lot of code for a year or 2 now at least, so I would have thought we'd start seeing some court cases by now?
The only real innovation for small planes is in the electric flight area - when you gotta do a full certification anyway as you're piloting an entirely new drivetrain, you can financially afford to be much more innovative on other parts of the design.