Earlier quoted context omitted.
Why is SEO'd site bad? The things you listed (domain & titles) sum up to: "Created something and it's easy to find, with clear descriptions".
And how are people supposed to find it if it's not SEO-optimized? Only Hacker News folks in-the-know? It seems like a really odd point to bring up.
Optimizing for search rankings doesn't say anything directly about any given site, but it's generally a signal for low quality content that would not rank highly without such optimizations.