Remember when everyone realized that HTTP was really good at what it did and since we already knew it, we should just use it and stop going crazy with proprietary / complex / lesser known protocols?
I think that only like 3% of people have realized that. The other 97% are still using huge "frameworks" and "stacks" to implement something as simple as caching et al.
But that's not what the article focuses on. Go read it. It describes use-cases for microformats.