Hacker News is obviously a very corporate-centred website, so most of the posts in this thread are about profitability and economic value. If that's the lens through which you see things, forking the web seems like a waste of time. It's obviously not profitable.
I don't care about any of that, I just want to have fun on the internet. By that metric, most of the criticisms in this thread are irrelevant. It doesn't need to make money, it doesn't need to be used by more than a few nerds, and it doesn't need a zillion bells and whistles. Whether rdg (the author of the blog post) shares this goal, I don't know.