Blame Benjamin Franklin for daylight saving, he first suggested the idea in 1784.
It was to make better use of daylight hours.
IMHO, it was to get more productivity from the workers so maximising profits for the wealthy.
Since then various reasons have emerged for daylight saving, including less vehicle accidents, less use of electricity and many others.
In this technological age we use more electricity than ever, and people drive like lunatics. So, in conclusion,
Mike.