People adding links to what they want to share in their comments rather than in the main post is a great example of humans adapting to machines rather than using machines to support human wellbeing.

Saying "the link is in the comments" and then adding links in the comments section make them more difficult to find for people with visual and cognitive impairments. Heck, they're more difficult for anyone to find once there are many comments on the post.

Yet this is the behavior that the design of LinkedIn encourages, and that many choose to act on. Because there is a strong belief that LinkedIn penalises posts with links to external sources, as showcased by a few studies.

The "visibility and click"-yearning becomes more important to appease than any yearning to cater to various accessibility needs. And yes, this is by design.

Sidenote: Some of my most viewed and shared posts on LinkedIn have had the link in the main post. I'm not even sure the widespread belief is a concrete truth.