Someone may enable trackbacks and disable comments - which is a good way to link into discussions people are having elsewhere without making your site look like a ghost town (empty comments = ghost town).

My article on SocPub this week was very popular, like 10,000 views in a week and 1,000 upvotes across Reddit and Hacker News - but for most of that not a single comment on SocPub. Nowadays people prefer to comment in their own private social spheres, or on community sites like Reddit. The web went under a tipping point some time back, without the network effect of people commenting on the main article site, effectively nobody chooses to.

https://indieweb.org/Webmention