I don't think the issue is that it's unimpressive if you're familiar with the domain. The issue is that, for what's actually been linked to, it's little more than a video showing some pretty interaction.

For a HN crowd interested in learning more about the domain, a blog post or something actually talking about it would be more appropriate and something that people can actually learn from.

A demo isn't something that people generally learn from. It's something that people look at, notice how pretty it is, and then move on, learning nothing.