What if all breakers would interchange with all appropriate panels? Wouldn't it be nice if you only had to stock one type of breaker instead of running around trying to find the one that fit correctly?
This would make our jobs much easier and more efficient. If most of the suppliers were to shut down, the remaining ones could consolidate their products and simplify production. They could still sell brand x breakers, but they would all fit in any new panel. Sure would make everyone's life easier.