As a voice teacher, Saul, I agree with you — it isn’t fair to the teacher.
But as a harper, I found this thread most illuminating. I don’t have a teacher because there simply aren’t any here, so this forum is my best resource. One of my goals this year is to attain a lickety-split, even arpeggio across the span of my instrument, so thanks for your question, Loon. 🙂