That still puts the fringes of a timezone possibly 30 minutes off from the ideal, and that is only the east/west direction. Places further from the equator are more susceptible to seasonal light changes.

Really I think time zones themselves are the problem. Prior to that each locality could adopt a time that worked best for them (horrible for trains and probably not compatible with modern communications tech, but easier on the people.) DST is a problematic patch on a problematic system.

Personally I’d like to see UTC adopted more broadly, at least for travel. Flying to NYC to LA takes 6.5 hours but you gain three hours due to time changes making it effectively 3.5 hours. Whereas flying back takes 5.5 hours but loses 3 to make it 8.5 hours. While I understand that intellectually, I find it hard to grasp intuitively. Just give me UTC and a relative time. Say 1900 (noon) or 1600 (mid morning)

It would also help with people living on either side of a timezone. Just say let’s meet at the restaurant at 500 instead of having to specify a timezone. Doubly so for coordinating online meetings with people around the country.