Why stay on summer time? Because this routes more available daylight to the evening, which most often (for the bulk of people) is used as personal time, family time, everything other than work and school.
We already give up so much to those institutions, I could not possibly support sacrificing another hour of daylight to them.
My 2 cents worth...
We want to do things on the sun. We don't want to have to carry torch. We want to get what little vitamin D we can get from more then just pills.
It is cool to see outside without having to go where floodlights are. Taking walk and see around, for example.
Just seems a bit disproportionate to offset everyone else's lives by an hour so you can have a walk in the sun or whatever.
The bigger question is why? Now that we have electric lights, why do you want equal daytime before and after noon?
On the eastern edges of current time zones. There's a 45-minute to 55-minute difference to cities on the western borders and many of them daylight time would be closer to "natural noon" than standard time.
I could also try and get my coworkers to move our meetings earlier in summer so I can leave work by 3, but for some reason changing a "clock" seems to be more effective than getting people to buy into summer hours and winter hours.
* There's some evidence that light is useful for the biological process of waking up and keeping people wakeful in the morning. Anecdotally, if it's a particularly cloudy day when I wake up, I am far slower to get going in the morning versus if it's a very sunny day.
* If you live in a region that is afflicted by snow and ice in winter, you want the sunlight to help with warming up pavement and melting snow and ice [in conjunction with road salt]. This use in particular isn't solved with artificial light.
Well why do you want it in the evening instead? There's only so much daylight. I'd rather get up and start the day with some sunshine.
That is your opinion which many do not share. As long as it is light out by 9am I don’t care.
[1] https://www.govinfo.gov/app/details/CFR-2003-title49-vol1/CF...
And that's kind of the upside of daylight saving time: in winter, when days are short, you really want to get the daylight in the morning not in the evening; but in summer, when days are long, you want to move the extra morning daylight to the evening. So DST is kind of a compromise where we suffer the negative results of the changeover to get the positive results of morning light in winter and the positive results of extra evening light in summer.