That's mainly because it has been set up, it's been debugged and it works predictably. The relevant policy there is "If it works, don't fix it." And that's ap

That's mainly because it has been set up, it's been debugged and it works predictably. The relevant policy there is "If it works, don't fix it." And that's apart from the fact that updating the OS would cost extra money that probably wouldn't be recovered during the lifetime of the machine.