I'll take your word for it; it's pretty shocking that it wasn't there from day one. As I've written elsewhere, it seems like Genius's vision of universal annotations is not really lined up with the/my/some tech folks platonic ideal of it - Genius seems to want to extend RapGenius to the rest of the web to enable a mix of both factual and editorial commentary, whereas the aforementioned ideal would be much more focused on fact checking, not just providing a universal commenting layer.
It's clearly a grayer issue than I first comprehended when writing my initial response to your work; I apologize for my strongly negative tone.
It's clearly a grayer issue than I first comprehended when writing my initial response to your work; I apologize for my strongly negative tone.