If I lived in a society where I got to set my own times, that would work perfectly. Get my kid up at six, force daycare to open and close an hour earlier, and have my meeting schedule displaced an hour earlier (hey, works well for those VCs to Stockholm, but those people are always in the dark in the winter).

Individuals have limited control over their own schedule, because of work hours, school hours etc.

They said wake up an hour early, not late, which has absolutely no impact on externally-imposed schedules. You have an extra hour to do X, whether that be exercise, getting baked out of your mind, scrolling instagram, etc.

You can't tell me that a society that burns, on average, five and a half hours daily on useless, mindless activities like television, sportsball, and social media is going to be even mildly perturbed by this. There's plenty of slack in the average person's schedule to move things around.