> Aren't the health detriments the same whether you shift your working hours / schedule or shift the clock?

Yes. I don't personally advise that we do shift working hours, I think that breaking people's internal clocks and wakeup time is harmful. But, if for some reason people really want to do that, we don't need daylight/standard time changes to do it.

> Aren't they effectively exactly the same thing, especially if they're coordinated?

Yes, and that's actually a really good summation of my point. We aren't doing anything magical with time shifts, we are just coordinating business/school times. But we are doing it in a way that is a lot more complicated than it needs to be, and that is in some ways a lot less granular and useful than it could be.

Not every part of the US needs time shifts in order to make sure it's bright in the evenings/mornings. There could be some municipalities/states where having seasonal work times might make sense (again, I don't think that's the case, but I can see the argument for it). Other parts of the US might not need that at all. The time shifts are a really clumsy system for handling winter sunrise times given just how large the US is and how much daytime variety there is across the country.

> And if they're not coordinated, isn't it a bigger mess in terms of knowing when things are supposed to change?

Personally, I don't think we need that much coordination and I don't think the current system really requires that much coordination or that it's desirable for everything to be synced up that way. I don't think anything would fall apart if we all stuck with DST permanently but in one state there was a local regulation that made retail shops open an hour later in the winter, or where school hours were different in the winter than in a few Northern states. I think that would probably be fine? I already have to check local store hours if I get up early and I'm visiting an unfamiliar neighborhood.

To go a step further, I also kind of feel like even that would be a mistake for many businesses (at least non-retail ones), I think forcing people to suddenly get up an hour earlier probably does more damage than seasonal depression for most people, and I would rather buy the remaining people with really bad seasonal depression sun lamps.

However, my point is -- the system is just obfuscating what we're really doing, which is shifting business/school hours. Even if you disagree with me about everything in the previous two paragraphs, even if you think this does need to be perfectly coordinated, and we do need to keep shifting business hours -- even in that scenario, we don't need DST/standard shifts to do that.

The time shift is just an illusion, what's really happening is the government is saying everyone should get up an hour earlier/later. Well, if we're OK with the government saying that, and if (for some reason) we want the government to say that -- then the government can just say that, it doesn't have to also force everyone to pretend that clocks are different. I don't necessarily think we should shift business hours at all, I'm just saying that we don't need to pretend that we have altered the timestream if we do want to shift business hours.