Kind of agree, but the obvious reason for doing it this way is so that you can support using multiple different players, or different users in some cases. Ideal

Kind of agree, but the obvious reason for doing it this way is so that you can support using multiple different players, or different users in some cases. Ideally a separate container for metadata, agreed by all, would be used but it takes time and some sort of special magic for such de facto standards to be agreed.