This requires essentially every business, person, and entity in existence to change hours all at the same time at least twice a year. It is far easier to just change the clock and know that a store closes at 8 than having to remember it closes at 7 starting this week. I get this is an age old retort, but it's because the common proposals always ignore reality.

-changing schedules is still a change.

-changing a single time is easier than changing infinite schedules.

-the change is going to suck either way because it's a change.