this would be dependency of new structure, on founding structure, and methods. a plan is developed early,and departure from that initial architechture, is a scorched earth style revision, versus patching old proven fixes,on new hardware.

its a tendency of biological systems to innovate one step at a time, as persistence is a demand, so the system is not overhauled large scale, that would be tantamount to major negative selection, thus non-persistent properties.