I see no need for daylight savings time, and I see no need for the authors suggestion of just two time zones in the continental U.S. - the suggestion is out of sync with reality.
While daily savings time is artificial, the time zones are a close geographic approximation of the world, divided up into 24 time zones approximating - from one to the next heading west, about one hour between each at set, at the starting point at about noon, so that noon, on the clock, occurs at about the same earth-solar moment - when the sun is directly overhead in each zone. It is an approximation of the natural time of the 24-hour day. Slightly artificial yes; mostly not.
That’s all we need to do, is restore and keep the basic orginal setting and leave it alone.
IF anyone should want, for their business, government office or organization and their customers to have some sort of “daylight savings time business hours” (open from 10 to 6 instead of 9 to five for instance), doing so should be at the discreation of each place, not a mandatory monkeying with the time on everyone.
When told the reason for Daylight Saving time the old Indian said, “Only a white man would believe that you could cut a foot off the top of a blanket and sew it to the bottom of a blanket and have a longer blanket.”