In the summer, we already have lots of sunlight regardless, so it doesn't make sense to optimize for that.
I don't think that's very realistic though is it? School times are fixed and that anchors a lot of families to those specific times, and businesses tend to have set hours.
Changing the time to give people more light in the evening frees up a bunch of people to enjoy some sunlight without making it a whole fight to have different hours at work.
If that's what passes for aspiration these days then the labour movement truly is dead.