If a secure API is released, and a secure app is produced, my work efficiency will crater.
But until that time arrives, I am going to be taking my laptop to work so I can log in during lunch, and send my companions on a few more missions. Why not make a little extra cash, or gather a few more supplies while chowing down.
My primary concern about this will still be the potential of having your login information passed through somebody else's app. Hopefully a mechanism will be available to have a hashed account that blocks actual logins, or access to the inventory, or something so that a compromised account can't be looted.
But I'm all for it, and have several iPads/iPhones/Androids that are ready to be used if something comes down the pike.