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If your job requires no interaction with the rest of society, that would work. As it is, people's lives ironically revolve around the clock and not the sun, so you're expected to be available from a certain hour of the day to a certain hour of the day regardless of the position of the sun.

In general I suppose I'd prefer to get off work around 10 am or so (if we're adjusting work to fit daylight to our free time). But I suppose there's indeed a cultural bias towards dragging everyone (in offices anyway) to 8-16 rather than 7-15 or 9-17.

Depending on where in the EU you are, it's already off.

Because we want 12 o clock to be the middle of the practical day, not the middle of the sun-day.

In typical 9-17 jobs, 12 is definitely not the middle of the practical day. I don't know anyone whose sleep schedule puts 12 at the middle of their waking period either.