I bet the Vulcans never tried to "Save Daylight" by changing the clocks twice a year

This is a good point. These position statements treat standard time as though it is synonymous with circadian alignment, which makes some bad assumptions. Fundamentally the bad assumption is that if there is light in the morning people will be exposed to it. Most people go from a curtained bedroom to a windowless office or classroom, and don't get much sun exposure in the morning whether the sun is up or not. It's arguable that the only thing that matters is whether the sun's up during free time, which for most people occurs only in the early evening.