I think it’s an interesting thought, but I also don’t think there’s such a thing like the „right“ timezone.

In Germany there’s some kind of cult that thinks GMT+1 is the god given timezone and a such „natural“, but in reality that just means that in winter the sun goes down at like 15:30 in Berlin where I live. And for anyone working in an office this means you go to work when it’s dark and you come back home when it’s dark, whereas if we would just stay at GMT+2 at least when going home there would be some rays of light still.

I think in the map you can rather see the division between northern and Southern/Mediterranean countries, because people in Mediterranean countries stay out longer and it’s just a cultural thing.