DNode is about Node APIs on the client, where as YUI is about x-client code. As such I'm assuming moving YUI based rendering back is a lot more x-client compatible than using DNode to mimic Node's I/O interfaces.

I think my point is that sharing JavaScript isn't the biggest challenge in this space. Having a cross-browser rendering system that also runs effectively in Node is.

While you could use DNode to make that, I'm wondering if it would be nearly as robust as what they are trying to do.