But if this happens, then California is out of step with the rest of the country.
Not so. Arizona has been this way for a long time.
I don’t think Hawaii observes daylight savings, but that’s a little different being several time zones away to start with.
In Tuba City Arizona, the main street runs between the Navajo and Hopi reservations. One observes daylight savings time, and the other doesn’t. I forget which is which. This makes it very difficult to show up anywhere, like for a movie, on time.