Musicianship is a very broad and complex subject and developing musicianship can seem like you're groping around in the dark.
How does music theory and all those scales and exercises work together to make music.
How do I put it all together?
How do I become a better musician?
I define musicianship as finding your voice. Finding your musical voice and being able to fully express yourself musically.
Of course that requires some technique and a working knowledge of music theory.
But you can't fully teach or learn musicianship in a classroom.
Music theory and technique can be taught, but experience is the best teacher for developing your musicianship.
Your music education must consist of performing live in as many different situations as possible.