This is a good suggestion, however, it might not be useful globally. People in the tropics/around the equator get so much sunlight that they would not want to trade the convenience of our current time systems with having to adjust it based on the sun just for that extra daylight.
People on the equator get no more sun time then anybody else. It's just that theirs is evenly distributed, they get ~12 hours of sun every single day of the year.
They'd be completely indifferent, their current clocks would still work, they'd just be annoyed at the other time zones moving around on them.
Fair enough, although my statement was more about the amount of sunlight they get per day, for all days of the year versus someone closer to the poles having to adjust to constant fluctuations.
You're right when you say that they get ~12 hours every single day, but their clocks would still have to account for the slight changes (by a few minutes) in time for the sunrise. Which means changing their clocks everyday/every few days, based on the sunrise. But for what? They anyway get ~12 hours sunlight, so it's not a worthy tradeoff for them, compared to someone in Massachusetts.
If only humans worked like batteries, soaking up the summer sun to use it in winters..
