Hello, Judd.
It’s a fair question. As I mentioned on another post related to a different topic, I can’t use slash regions for those rests because of requirements from the client I work with. I normally modify and format batches of old XML files, and I also export the corresponding parts. The files that use slash regions normally come already with those regions established, so it’s unfortunately not up to me to modify them.
I agree that for normal uses, slash regions should be the way to go if I wanted the player to accompany or improvise over those measures.