As far as I know this is a relic from the PG days. It was done to keep the focus on URL based submissions, and avoid people using the platform as a text/blogging platform (at the time, Reddit was rising, and self posts there were already very common.) URLs were dark, text was meant to support the URL and was lighter.

I think the color actually got lightened a few times.

Was the text light grey before you clicked the comments? Typically the link turns from almost black to light grey after you visit the site, just like a normal link will turn from blue to purple after you click the link to indicate you have visited the site. In this post for example the link goes to the 'Tell HN:' so the link goes directly to the comments. Could it be you did not pay attention until you had visited the comments once already??

It’s way, way too low contrast.

Edit: “@dang” apparently doesn’t ‘work’, but emailed this to hn@ycombinator.com

I always assumed it was the down arrow affecting it, but I have always giggled at the fact that people with sharp eyes have to endure the bad posts while others do not