For my work as a clinician/demonstrator, I had to know the instrument's features/functions very well (technical knowledge), and have the musicianship to present the instrument properly.

I tend to treat keyboards as musical tools, and spend time learning to operate them effectively, but, I also spend a good deal of time every day to keep my chops up.

I need both skills, but if I was to choose the more important one to me...it would be musicianship.

Ian