This is by far the more important aspect

Humans are routine oriented creatures, introducing an arbitrary hour deficit in sleep once a year has measurable and fairly profound effects on physical and mental health. Sure, it can be planned for, but circadian rhythms are hard to mess with for a lot of people and going to bed an hour earlier isn’t always an option

Cool. But stay on dst anyhow. It's way nicer to never have it be dark at 5pm.