Yes you are right, it's not the strongest argument, I could have gone deeper into the analytics. I was thinking about <dl>, <ul> and <ol>, which only about 0. 1% - 1% of websites use. The number of sites on the internet with any type of list content is clearly higher than that. And when you couple that with the fact that influential sites are publishing div soup, you can tell that most of these tags are underused.