When a meeting is set up and time shifts happen, in practice people don't know what time the meeting is. Same for the rest. I'm not concerned about whether you can calculate it in theory (you actually can't in general, just the common cases) since it doesn't happen reliably in my experience. There were also many cases of things incorrectly applying DST when I lived in AZ.
Also, I assure you people care very much about how long ago they worked when it involves their paychecks and hours worked. Datetime/DST bugs in payment systems and other critical computers are scarily common.
Plus the billions in social costs. Children have to dream with sleep deprivation, hospitals have to treat more strokes, pollution worsens, and criminals get longer sentences.
I'm not sure why changing opening hours is difficult. It's incredibly common to have off-season and high season hours in tourist towns. You don't have to coordinate anything. If the idea of multiple hours is too difficult for anyone, they can simply pick one or the other. Nothing bad will happen.
The benefits we get for the trouble of changing the clocks are minor.
If you are saying that mistakes will be made, I agree. People make mistakes all of the time. About things easier than schedules.
If you want to single out the idea of "shifting timezones" being how we accomplish DST. I agree that is problematic, at best. I can assume there were reasons to do it by completely changing what timezone an area is in. I struggle to understand them, myself. Especially when we don't do the same for other time shifts. (Leap years and seconds, in particular.)
I further agree that doing it in one hour jump is bad. Is literally why I suggest shortening the jump to 10 minutes would be fine. Argument being that that is far more natural for how time was felt by people for most of history. (Indeed, originally, hours were not fixed in terms of how many minutes they took.)
But no, nobody cares what time you said they clocked in yesterday. They care that you accurately pay them for how long they were clocked in for. Obviously, you have to make any system that deals with those work correctly. But, again, people make mistakes on those already, irrespective of timezone changes.
For evidence, see how little energy people expend on how incomprehensible airline tickets are. Look at a ticket and see if you can quickly say how long a flight is. It isn't like they don't know. It just doesn't matter on your ticket. (Even if I like to consider my options based on how long I'll be in the air...)
Is it a good argument to not necessarily change things? Yeah, which is why I think my suggestion of 10 minute changes is largely silly. A lot of inertia in the system we have is not necessarily a bad thing.
Getting everyone to change their operating hours just feels daft to me. And, ultimately, how is that any different?
For example, you want to get it so that schools start/end an hour earlier starting a week. Which means that we still have to deal with the idea that you have to shift your sleep. Probably wise to also go to sleep an hour earlier. And, yeah, I think people could adjust to knowing that they have to change their bedtime from 9 to 8, for example. But, there is a reason we try to keep sunrise and sunset as close to consistent times as we can. No matter where we go.
I'm somewhat sympathetic to the data about how much worse the week of the hour loss is. I'd be curious to know if that is better or worse in recent years. And I genuinely don't know how to square the fact that the data dang near cancels out with how much better it is in the week we gain an hour. That, honestly, feels a bit too convenient. (And again, this just gets me back to the idea that the problem is losing a full hour.)
Also, I assure you people care very much about how long ago they worked when it involves their paychecks and hours worked. Datetime/DST bugs in payment systems and other critical computers are scarily common.
Plus the billions in social costs. Children have to dream with sleep deprivation, hospitals have to treat more strokes, pollution worsens, and criminals get longer sentences.
I'm not sure why changing opening hours is difficult. It's incredibly common to have off-season and high season hours in tourist towns. You don't have to coordinate anything. If the idea of multiple hours is too difficult for anyone, they can simply pick one or the other. Nothing bad will happen.
The benefits we get for the trouble of changing the clocks are minor.