Despite having equivalent features, I'd go out on a limb and say a blog and a bug tracker have very different UI requirements, so it's only appropriate to use one as the other insofar as you don't care about user experience. As an example, I read that post and had no idea it was part of a blog until I saw the repo path was "/blog" and figured out that they were trying to be cute. I then clicked on the root of the repo to see the root of the blog and saw the explanation and a link to /issues to "read" the "blog". I was then presented with a list of issues that was only the post I had just read, and at that point I said oh fuck it I don't care to figure out whether there are more "blog posts" if I remove the "status:open" search criterion and I closed the fucking window and then saw your comment explaining that an issue tracker has all the features a blog needs.
Ok.