Some people don't care about the local timezone, even without a need to stay up odd hours. And for western Europe, you don't even need to work ridiculous hours

Some people don't care about the local timezone, even without a need to stay up odd hours. And for western Europe, you don't even need to work ridiculous hours. If my current core hours (9am - 3pm) were in PST and I worked in Paris, I could finish my workday at 11pm in Paris.