This is a very valid point, and one which I've been casually warning people about since I saw the movie Gattaca. Since then, I've developed a new saying:

Guns don't kill people, databases do.

Since when did farmers abide by a "work day" or a "work week"? Daylight Saving doesn't magically SAVE any amount of daylight, it doesn't change when the animals stir (like the rooster crow or the cows milking), nor the crop growing season.

DST is quite the opposite of a "stone age" concept, because DST requires a CLOCK.

Can you imagine shifting all the rocks at Stonehenge 15 degrees, twice a year?