> and others (north europe) want to stay on their solar time.
Closer to their solar time, for quite a few. As an extreme example, most of Spain lies West of the prime meridian (some parts of it even west of Great Britain, the island), but its time zone is an hour ahead of that of London.
But does solar time matters nowadays? In modern day-to-day life noon is not 12:00. People wake up at 5-6-7. And go to bed at 10-11-12. Even for early risers, middle of the day is well past 12:00. Having DST time makes solar mid-day closer to factual mid-day. I'd even argue to for +2 hours DST :D