Thinking even more about it, many changes are "cosmetic", such as renaming fields or restructuring essentially flat structures. These may make the system more c

Thinking even more about it, many changes are "cosmetic", such as renaming fields or restructuring essentially flat structures. These may make the system more consistent and easier to understand for newcomers, but break old code for "no reason". So developers should develop some kind of taste to distinguish between "real" changes and "cosmetic" changes.