I agree with the rest of your posts, but disagree partly with bold text. The more complex music I get the more physical I can get expressive. That expressiveness cannot be seen from the outside so much usually. But communication through listening other partner and the music can be quite complex. It's true that both of dancers need to be feel free in musicality and physical part. So the musicality vs physical part can be chosen depending on quality in certain areas. And the musicality is often neglected so and needs special training so we get more physical but less musical.