[rlpb]

I agree with this in principle but I also acknowledge that in practice it's not so easy. Changing the "official" local time means that every interaction is changed in a coordinated way. Otherwise you have times specified in contracts (eg. employment contracts), official school timetable hours, rush hour train schedules and a million other things that have settled together so that they coordinate, that is a huge social challenge to adapt in a coordinated way without huge disruption while that happens.

[mongol]

Yes, but I think that only makes sense when it is obvious that a very large part of society benefits of that way. I don't think that benefit is sufficiently clear, some people prefer one way, and others another. Then society should not interfer.