I think what we're doing is substantially different. The focus of my projects tends to be in publishing and tools for development. I see their product as being useful in that context, but I don't think there's a big conflict. If we are able to co-exist with products that support OPML, surely we can do the same with Markdown.

If any additional features are needed in Drummer's support for MD, they must be driven by an actual interop use-case, nothing theoretical or nice-to-have-for-the-future. That's not enough to extend the format. It has to be about creating utility in the interop between the products, driven by actual use.