Think of a skill you have mastered. Now try teaching that to someone else, step by step. Because you have picked up subconscious cues of what works and what doesn't throughout the years, you will find it impossible to help someone reach your level of expertise by trying to share your ideas with them.
Then what about the great teachers, who are respected and put on ecclesiastical heights? They do not teach. They demonstrate. The students copy but they aren't the good students.
A good student, not only copy, they mould and change the methods to suit their strengths, allowing their own subconscious minds to soak in what works and what doesn't.
So, if you are a teacher, do not teach, but demonstrate. Not everything, but a few things.
And, if you are a student, do not copy, but adapt. Everything, not just a few things.