As with software, restarting from scratch can introduce many, many bugs.
Boeing planes are super safe from millions of flighthours and the learnings and failures from before. The older aircraft annealed into a state of safety and reliability from known-ness.
Building from scratch isn't really building from scratch is my point. You build off of what you have and revisit designs. They aren't reinventing the aircraft.
Boeing planes are super safe from millions of flighthours and the learnings and failures from before. The older aircraft annealed into a state of safety and reliability from known-ness.
"fully redesigning," introduces a lot more risk.