Aircraft manufacturers and operators go through great amounts of effort to avoid single points of failure. E.g. on a twin they overhaul the two engines at diffe

Aircraft manufacturers and operators go through great amounts of effort to avoid single points of failure. E.g. on a twin they overhaul the two engines at different times. But this is different. I wonder if they need to rethink their approach to software? Four engines, running the same software --> single point of failure.