Comment by whizzter

Yes and no, it was thought to make sense for "end-user-programmers" where it's helpful to be fully locale specific, I'm Swedish and my OS settings makes programs expecting comma (,) signs for decimal separation is something that's actually hit me today when copy-pasting between programs.

So in practice, while it was kinda useful to be locale/region dependant for some users it's probably been more trouble in the long run to be overly helpful.

C# was released after y2k, so they don't have the excuse.

Also, You're missing the biggest sin here however, locale specific time is OK, automatically allowing conversions/comparisons to points in time types without specifying timezones has in principle never caused anything but grief.