I'm getting the impression that by analogy, DotRSB lets you play music that someone else has written; but to be good at drawing, you need to be able to play music that you've written yourself. And that's a valid criticism, but playing someone else's music is still fun, while writing music isn't going to be much fun if I can't play it well. So it seems reasonable to quickly get good at playing, and then later I can learn to write.

Does this seem like a fair assessment?