Unless you are outright promoting commercial stuff, I feel for writers who are relatively unknown and would like to get feedback on what they write, HN is a good place to post links.

This is not different from posting interesting links you find. It is not self-promotion as you are not selling anything here. Instead you are trying to see if the content resonates with others and kickstarts a discussion.

In fact, I see it as no different from the comments we are writing here.