> I don’t fully understand why it is such a big deal to have one’s schedule disrupted by an hour,
Circadian rhythm is a big deal. When you have millions of people disrupted on the same day, things will go wrong. Increase in accidents and deaths from accidents seem to be in 5-15% range for 2 weeks, this seems on order of 100 people. Judging by how society approaches much higher covid deaths, nobody will be in a hurry to change the law for “just a hundred people” despite Gemora Sanhedrin saying that one who save one life saves the whole world …