It would be nice to have a closed loop board I could put on the back of a stepper that would communicate to the controller with BT. And the other GPIO should still be available for add-ons in the vicinity. If it had a built-in 9/10 DOF chip then it would even know where it was in relation to the other modules, like in a 3D printer or robotic arm. In a robot it could use BT mesh to make sure it got a great signal with the first transmission in order to avoid accidents.
Just a thought,
David
