https://www.musical-u.com/learn/musicality-means-playing-from-a-lead-sheet/
Playing from a lead sheet truly matters because it’s the perfect test-bed for your musicality: Learning to play well from a lead sheet offers you the ideal opportunity to develop the “inner skills of music” you need to be a confident, capable, expressive musician. https://www.musical-u.com/learn/musicality-means-playing-from-a-lead-sheet/