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I like where @the-old-coach is going with his answer. This is the area where I live. Exploring the nature of lessons. That is the “or what?” part. I have found that even a single note or, two notes a half step apart can make for interest by using rhythmic variation. Sneaking in a triplet somewhere and giving it a place is pretty fun and cool to do. Even ear training can be done by playing exercises with/in harmony as opposed to doubling. There is no end to what can be added or taken away to increase complexity (this also works if reverse: all exercises can be simplified). People are pretty good about posting variations they find useful in the exercise’s comments too. I am going to put in my 2 cents on the final destination of my journey as well. This is tension reduction. I wish it had been my start too but live and learn. There is no end to being more relaxed attacking the strings more precisely to produce greater sonic complexity. This is the land of tone and dynamics. Infinity lives here.