> there is a case to be made for a timezone split between northern Europe and southern Europe

There absolutely is. The north is getting very little sun in the winter (about 6 hours) and very much in the summer (about 19 hours), while the south has a lot less variance (10 vs 14 hrs for south of Spain.) My argument would be that the south needs DST more than the north.

> But I do live in the North and in the EU... I care a create deal about not being stress and depressed.

I understood that and I genuinely sympathise with the daylight-related syndromes people up there in the North have to deal with, but you also have to understand that further South we also become depressed if the Sun comes down too early, especially in the summer. So from an utility and democracy point of view the wellbeing of the majority (and the vote of said majority) should take prevalence over the wellbeing of the minority.