Laptops are mobile. Microsoft Surface devices are mobile. iPads with bluetooth keyboards are mobile. Developers also tend to spend quite a lot of time sittin

Laptops are mobile. Microsoft Surface devices are mobile. iPads with bluetooth keyboards are mobile. Developers also tend to spend quite a lot of time sitting at desktop-class machines with nice big monitors, because amazingly enough Emacs/IntelliJ/Visual Studio/whatever doesn't run on an iPad mini.