I personally like the summaries. Papers are typically written to sound smart, not to read nicely. HTML scales, users can configure the font, you can click pictures to enlarge... but instead we choose to use PDFs. Why? I speculate it is because everyone else who sounds smart does it. This particular paper is not as bad as most (no serif font, 8pt text, small and unreadable diagrams, references instead of practical links) so it's definitely not all directed at this particular paper, but I do question the usefulness of linking to a longer text instead of to a useful summary that has a link to the longer text.
GP is right in that the first 15 words of the tweet told me more than the whole 269 word blog post. I also recognized the author on Twitter but not on the blog. I'm happy the tweet is still linked in the comments.