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At this point you've thrown out the utility of time zones and may as well just go back to the pre-time-zone status quo of defining noon in every locality as local noon.

A single time zone within a small state, or two or three within a larger state, still has some utility for local events.

But yes, in the age of smart watches, there’s no reason not to skew time by a few minutes every night for a more consistent experience. Using local noon as an anchor isn’t optimal because wake up time will still vary. I argue that wake up consistency with sunrise is the most important feature for humans.

I'm a big supporter of 2D-defined time-zones, but not for what your're saying.

The overall debate revolve around daylight which change in function of one's latitude.

With an internationally agreed grid (e.g. current longitude division plus steps of 15° of latitude), we may solve those problems easily for everyone, wherever they lives.

The proper solution to which problem?

The problem is that humans evolved to rise with the sun, and anything less is an unnatural stressor.

But humans did not evolve to rise at 6 a.m. What you propose would create way more problems than it solves.