Obviously if you have at most 8/16/32/64 bit types (only making new types because of physical constraints), you'll have way, way fewer breaking changes than if

Obviously if you have at most 8/16/32/64 bit types (only making new types because of physical constraints), you'll have way, way fewer breaking changes than if you try to encode bounds extremely tightly and try to update them whenever you 2 instead of 1 somewhere. In fact most software is designed such that the physical sizes are chosen first, and then the practical bounds follow from that.