Bastion's argument for doing away with cross-platform development

Bad title on the part of Gamasutra, as that is not what the Bastion developers said...at all. The Bastion developers are actually strongly in favor of cross-platform development, and cite it for the success of the game.

They merely noted in this discussion that they restricted their design for mobile ports to be playable with one hand. Thus, the key to success was that their ports were truly "ported" to the target system including the target system's method of input (generally, touch/gestures) rather than just a superficial port with a semi-functional virtual gamepad.