One thing that's interesting about the AI violin cover is that I'm not sure those runs would be physically possible at that speed on a real violin. So that composition can _only_ be played digitally, I believe.
When I used to do larger more orchestral arrangements, I was constantly getting dinged by the instrumentalists that while they were theoretically musically possible, certain runs or passages were very unnatural on the instrument that I scored them on.
For a long time I really hoped that some of the more professional notation tools such as finale would add in an ability to analyze passages and determine how realistic/natural they were for the instrument that they were set to.