What are the underlying mechanics that drive Zwift avatars to seemingly develop a mind of their own, and how do these mechanics impact the overall riding experience? Is it possible that the algorithms used to animate avatars are becoming increasingly sophisticated, allowing for more realistic and unpredictable movements? Or is this phenomenon simply an artifact of the games physics engine, which can sometimes produce unexpected outcomes? How do the developers balance the need for realistic avatar behavior with the need for a smooth and enjoyable user experience? Are there any plans to introduce more advanced AI-driven avatar behaviors that would further enhance the sense of immersion and realism in the game?