The biggest unreasonability is switching at all. I admit other points of view, but switching back and forth is a compromise that seems far worse than just sticking with one. Either one.
We seem to be in the worst situation now where not only does the EU change their time twice a year, they change it on a different schedule than US/Canada.
For a few weeks during the year, half of your meetings start at a different time. Everyone is confused.
Coordinating that change for the RELEVANT parties, yes. IMHO that's a tiny part of a society.
Instead of everyone EVERYONE having to adjust clocks and their natural schedules. I think (and some studies agree with me) the stress and negative effects of that switching twice a year is much more on aggregate.
I don't personally see any benefit from daylight savings. But I also live at around 60+ degrees North: at peak summertime there is 19 hours of full daylight (barely gets dark the other hours), wintertime less about 5. Daylight saving does not really make a dent.
With switch, we get reasonable half a years. Without it, it would be whole unreasonable year.