Especially when the code is directly responsible for a physical system.
In my opinion the 737MAX needs a distinct type certification. This would dramatically raise costs, so it is covered up with software. FAA and regulators in other countries don't care. This management and regulator problem is enabled by all off the passengers who pay for seats on this plane.
I don't care if Boeing decided "this revision" of the 737 Max is safe. I insist on only flying in airplanes that the pilots were trained to fly on, without a compatibility layer between the pilots' training and the airframe characteristics.
The crime of the 737Max was that the MCAS fucking shit into the wind and introduced an unbelievably dumb stochastic failure mode (every X seconds MCAS adjusted the stabilizer), and the pilots had no idea what's doing it.
I don't fly often, but I go further. I just don't fly Boeing unless it's a 747.
747 || Airbus || Embraer
My airline of choice is American. I can see what a particular route is flying prior to purchasing tickets. There are enough Airbus aircraft in their fleet for me to pull this off.