I believe the common problem is when creators who submit their work on HN don’t open with what differentiates their version, thus exhibiting a lack of awareness about existing solutions. And there is a cost in attention for HN readers to figure out if there’s anything new and interesting about the work. There is an expectation that HN submissions should be worth the reader’s while.

I was thinking more broadly when I wrote the comment. I agree about the tighter focus of HN.