It's a social invention that is easier to change simultaneously by law, good luck having each business, school make decisions about the "right time" to open. And good luck knowing if each business that you are interested in decides to open earlier during summer or later during winter...
Ultimately you need to understand that the "human invention" is not following the realities of seasons which is a simple cosmic fact, not an invention.
DST it's just a way of trying to sync the human invention twice a year to match the cosmic reality better. Ignoring the reality is worse than changing the time twice a year. Do you have a better solution?