[XorNot]

For the same reason that work from home turns out to be viable for a huge number of people, and the main reason office's are as big as they are is because middle managers don't believe work happens if they don't watch someone sit in an office chair.

There's no possible way businesses are going to adjust their hours twice yearly to let employees get more sunshine, but DST does that effectively by ensuring official timekeeping gets moved about on them.

[bombcar]

The even dirtier secret is that NOBODY KNOWS if work is getting done because often the work is pointless or ill-defined.

[GoblinSlayer]

What is the point of sunshine if you sit in a box all day? You get equally zero amount of it during summer as well as winter.