I read somewhere that one reasoning is with DST, children need to leave for school early, which is relatively unsafe (evening is not a problem because school ends earlier). But I guess the perfect solution is simply shorter work hours across the board :p

I don't get it, why does it matter at all? Isn't it just a perception. If you live in Alaska there are days where there is always sunlight and similarly days where there is no light.

Despite being able to survive in nearly any earth climate, much of human biology evolved in a narrow environmental context.

Yes, humans survive in Iceland, but since a lot of our evolution occurred under near-equatorial sun, people notice that some of the “nice to have” chemical reactions in our body (e.g. our circadian rhythm) are less common when there.

If one’s prefrontal cortex decides to use executive functioning to have the rest of the brain “ignore” that problem, that’s one solution, but many people can’t do that or find it very taxing to do so.

Even that can achieved by changing the time you do things. Like schools can be 1 hour early at a particular time of the year instead of changing time for everybody else.

Honestly I can't think of a single legitimate reason why you would want to hang onto daylight saving time.