Most devices do still in fact require setting the clock. In my home right now, I have a computer, a phone, my microwave, my stove, and my car which all have clocks. Only the first two of those have the ability to sync time from an external source.

I’m curious about your school or job/work schedules. Or how consequential it is, when personal scheduling isn’t kept.

If a personal or family routine is not robust enough to handle an hour of variation I wouldn't expect the dst changeovers to register in the top 25 most disruptive yearly events.

Your understanding is backwards.

We see increased deaths with the time changes. Car accidents. Heart attacks. There is a real cost.