The US Senate recently approved the Sunshine Protection Act, which aims to make DST permanent in 2023. I agree with abolishing the practice of changing the clocks twice a year, but I prefer to keep standard time.
There is the argument that DST provides light later into the evening, but then it means that those who are awake in the mornings will go to work or school in the dark. Natural sunlight is important to reduce sleepiness (circadian rhythms depend on sunlight), which could mean that more drivers are less awake and less alert under permanent DST. If light lasts into the later hours, it can push your bedtime to a later hour, meaning even less time to sleep if you follow a strict morning schedule.
When the sun is at its highest point in the sky (at your location), we call it (solar/high) noon, it’s why the planet was divided into time zones. Permanent DST would ensure this is no longer the case. Timetables could be thrown off, impacting transportation, communication, and other businesses that cross time zones. What about those who observe religious rituals based on sunrise/sunset?
The US tried a two-year experiment with permanent DST starting in January 1974 hoping to conserve energy (during an oil crisis). It failed and ended early in October 1974, before they had to go through another winter. These days, gasoline use could even increase since people would be encouraged to get more stuff done.
What would happen to the areas that never observed DST, like Hawaii, Puerto Rico, most of Arizona, and many overseas territories? According to the Sunshine Protection Act — nothing. They will be allowed to stay on standard time. So what’s the point?
One City At A Time 