The sunrise and sunset doesn’t give one rip about DST or not. How you schedule and manipulate your day and activities can be by clock, or it can be circadian. The options are to ‘adjust’ supper with the ebb and flow with DST, or leave it to natural rhythm.
While your thought might be correct it is irrelevant in American society that has a “Work Day”
The work day and associated school day are fixed hours about which other life revolves.