The further south you are, the less desirable it is. Arizona and Hawaii don’t have it, as I recall. They may as well not bother.
Up there in Massachusetts it does make a difference. As I recall, some foreign countries have double daylight savings time.
I suppose Alaska is so far north it doesn’t matter...you’re going to get 20 hour days in the summer and 4 hour days in the winter.
In general it should be a state issue not a federal issue.
However the zones need to be contiguous.
If New Jersey doesn’t want it and New York does and Connecticut doesn’t and Kassachusetts does, I think it is a proper use of the interstate commerce clause to overrule the states.
Cutting one foot off of a blanket and sewing it on the other end does NOT give you more blanket!