> The zones we have now are arbitrary though, imagine if there were twice as many, or half as many, it wouldn't really change anything right? They aren't arbit

> The zones we have now are arbitrary though, imagine if there were twice as many, or half as many, it wouldn't really change anything right? They aren't arbitrary. They're a compromise/trade-off between several conflicting goods (e.g. aligning the clock to solar time and using time for regional coordination). If you change their number/size on goal will get worse and the other better.