Same with open source projects (or other software projects in general).

Pre-2022, when someone posts a Show HN, even if it's not something you would normally be interested in, there's a baseline understanding that _someone_ cared enough to spend time and effort to build it. So in a hypothetical future scenario if you do find yourself looking for that particular tool, there was value in you seeing that Show HN so you can revisit it.

Now, I just ignore all Show HN posts.