Earlier quoted context omitted.
Information density and ease of identification is the antithesis of "engagement" which often has some time on site metric they're hunting. If you can find what you want and read it you might not spend 5 extra seconds lost on their page and thus they can pad their stats for advertisers. Bonus points if the stupid page loads in such a way you accidentally click on something and give them a "conversion". Sadly financial…
The one and only thing I'd do is make the font bigger and increase padding. There's overwhelming consensus that you should have (for English) about 50–70 characters per line of text for the best, fastest, most accurate readability. That's why newspapers pair a small font with multiple columns: to limit number of characters per line of text. HN might have over 100 chars per line of text. It could be better. I know I c…
Different people process visual information differently, and people reading articles have different goals, different eyesight, and different hardware setups. And we already have a way for users to tell a website how wide they want its content to be: resizing their browser window. I set the width of my browser window based on how wide I want pages to be; and web designers who ignore this preference and impose unreadable narrow columns because they read about the "optimal" column width in some study or another infuriate me to no end. Optimal is not the same for everyone, and pretending otherwise is the antithesis of accessibility.