This is one of the more serious pain points I notice (thankfully only occasionally).
Obviously getting some visibility is important for people launching new projects. Sometimes adversarial comments seem to be motivated by commercial rather than technical reasons.
No kidding.
On most Launch / Show HN posts half of the comments are "CEO of yourdirectcompetitor.com here, cool project, good job, here are some irrelevant questions so that my obvious self-plug doesn't get deleted."