Another keyboard-only player here. I just find using the mouse really cumbersome. Having to move my hands so great distances constantly to, for example, type something...I simply don't like it.
I know they've said before they wouldn't screw over us keyboard-only players, but that was way before, and since then I seem to recall Yoshi-P wondering in an interview when it was asked if people really use such an option, like it was somehow inferior and beneath notice. And as if he didn't know it's an FF staple for many of us. It makes me really, really worried, especially with all the mouse-centric control schemes I keep hearing about. :/