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xkcd #2846: Daylight Saving Choice
(imgs.xkcd.com)
Alt text:
I average out the spring and fall changes and just set my clocks 39 minutes ahead year-round.
But you are making assumptions which are not really true anywhere. Working hours I Spain and Germany are already white different. Main reason is of course that they share the same time zone by law, but are not geographically in the same time zone. But there are some additional differences in culture which extend this effect.
Sure, but it's still true that businesses operate during hours similar to any other places in the world. Even in Spain, ~9 to ~14 then ~17 to ~20, the day time hours are still in the "rest of the world bracket".
Sure, but that still means you are not reaching someone by phone at work during 4 hours of you previously mentioned 8-17 Windows.
As someone currently working from Ireland with my usual office in Germany (laptop still configured this way) with a Team from India and DST ending next week, I would prefer to drop the calculations and just remember when each colleague approximately comes online. That is not the same for each colleague and day anyways.
But if my plane lands at 9am local time, I know it's the morning at least and I can plan my day appropriately (stores will be open or opening soon instead of just closing for example)