Another thing nobody seems to realize is that we've already tried this experiment once before, and it was an utter failure. Quoting Wikipedia:
Permanent DST in the US was briefly enacted by President Nixon in 1974, in response to the 1973 oil crisis. The proposal was initially supported by an estimated 79% of the public; that support dropped to 42% after its first winter, owing to the harshness of dark winter mornings that permanent DST creates. An estimated six school children were also killed by motorists due to the new law. The new permanent DST law was retracted within the year.
https://en.wikipedia.org/wiki/Permanent_time_observation_in_...
Where I live these things vary by a lot more than an hour, so DST has a meaningful effect on any of these supposed benefits for about, if I'm being generous, 2-3 weeks a year. It's silly.
[1] https://www.sciencedaily.com/releases/2010/10/101014144314.h...
Your circadian rhythm is actually mediated/regulated/communicated to every cell in your body by a diurnal oscillation of YOUR BODY TEMPERATURE, which is coolest around 3am and warmest around 3pm.
These times just so happen to correspond with the times of coolest and hottest surface air temperatures on earth - and it's not a coincidence that our bodies evolved that way.
Now, in the summer, the hottest time of the day is actually LATER than it is in the winter, since the sun spends more time in the sky and the earth has more time to heat up. So it makes sense to align our circadian rhythms with that by springing forward one hour before summer, and then falling back one hour before winter - when the hottest time of day starts to edge earlier.