I have mixed feelings about this. On the one hand, I agree: text is infinitely versatile, indexable, durable, etc. But, after discovering Bret Victor's work[1], and thinking about how I learned piano, I've also started to see a lot of the limitations of text. When I learned piano, I always had a live feedback loop: play a note, and hear how it sounds, and every week I had a teacher coach me. This is a completely diff…
Can you explain what you mean by "This is... something that doesn't work well with text"? Text as opposed to what? If you were to "play" music by typing notes, then you would compare your typed note against the string of correct notes. Of course that sounds a bit silly, and probably not what you meant, so, please elaborate.
An example of where text falls short: if I said "be sure to rainbow your wrist when jumping in that passage," it wouldn't make any sense unless someone had seen an explanation. I suppose I could try to explain "when moving higher, make an upwards arc, and loop around at the end, to prevent jerking your wrist around when going back and forth," but even then that's still way too ambigious, since there's also a certain way you need to pivot your wrist so you can hold onto the upper chord as long as possible. It's just much easier to demonstrate and see if the student did it correctly.