People increasingly use laptops as their primary computer. If they enable this feature to use on their home network, they could easily forget to disable it then

People increasingly use laptops as their primary computer. If they enable this feature to use on their home network, they could easily forget to disable it then they bring the computer with them to a more hostile environment. (But, on the other hand, isn't the Windows Firewall in Vista and newer designed to handle this, by having separate rules for "home", "work" and "public" networks?)