For me it is just another choice, m1469, an option. I CHOOSE to what degree I shall use emotions, intellect and so on. It has to be said though that "emotion", although I do use it if I want to, has nothing to do with those transporting mental states which provide the reason for my playing the instrument.
I suppose it would be easy to become accustomed to making the same choice every time, just as some improvisers play the same old cadences day in and day out until their initial mental effect is long forgotten. After a while a habit is established and no choice appears to exist. In the same way, and I'm guessing here because I do not perform, perhaps concert artists, in the interest of safety and professionalism, habituate the same old combinations of emotion and intellect long after the reason for their use has been forgotten.
I dread to think of arriving at this state of affairs; I would rather risk a new choice and crash. Then again, that's easy for me to say I guess.