I heard that in the US every state is using its own view on a daylight saving and it's hard to tell what time is it if you're moving through the country. Why do you think that abrogation of daylight saving time is very confusing? Actually, this is the only normal law in my memory. There is no much to explain, Russia is the largest country in the world and actually time zones not very helpfull in saving energy, because illuminance is different even in north and south part of the same time zone.