Because it isn't about volume, and blogging is an inherently informal style in many cases (says someone who both publishes academic papers and has a blog). As

Because it isn't about volume, and blogging is an inherently informal style in many cases (says someone who both publishes academic papers and has a blog). As for readability, clarity of writing and visual clarity are not perfectly correlated. I have read very well-written papers that were still painful to interact with as physical objects.