Who said we need to discretize the globe into 24 zones with same tim ein each of them? Is this halakha l’Moshe l’Sinai?
Maybe have one US-wide time? Ok, the left coast will need to get up a little earlier…. Russia might have a problem with this. Or go to another extreme: everyone should have time based on their exact location. When NY has 9:00, Monsey time is still 8:55, so you can sleep for 5 extra minutes. And Long Islanders can start davening earlier. Everyone can go to the town with the preferred lifestyle to a minute.