the only thing that changes is the number on the clock. So adjust your life based on the actual darkness. Start work an hour earlier, go to bed an hour earlier, etc etc.
It must be nice to have those options, but hardly anyone does.
One example off the top of my head where a change for an earlier summer night would be summertime local events.
Currently, they start after most people have had dinner, and end while it's still daylight. This is a good thing since many venues don't have the appropriate outdoor lighting. These would either have to start earlier and interfere with dinner, or later and run into it got dark. That would be awful.
Workplaces that are 9-5, factoring in a commute and dinner, some people might never see evening daylight all year if it were cut short.
What benefit would it actually give, other than not needing to argue about it every year? 😂