Hard disagree with everything in your comment, but it's cool to have elicited a reply from the Pinboard guy.
> This discussion conflates comments with highlights, which are two different animals altogether.
And this
> The distinguishing feature of highlights is that they are anchored to a specific passage in a (hyper)text
And this
> Comments are an entirely different animal
And this
> Binning bookmarks, highlights, and comments together as "content" is like calling wedding cake, bobcats and lighter fluid different kinds of "matter"; it's reductive to the point of uselessness.