The history of DST is distinct from agriculture, it was more strongly connected to factory work. It's easier to have every employee change their clock by an hour than change the schedule twice a year.

However, we've moved away from the need (mostly) for the potential energy savings, though perhaps for the wrong reasons (we work in offices and factories with little natural light). The remaining reason to keep it is to allow people access to daylight after their normal work hours. But this can be accomplished by shifting schedules. Move the standard start of work from 7 to 6:30, split the difference. And if that seems intractable, shift our time zones by 30 minutes and be done with it.