Again, you're not wrong, and I'm not even saying these comments are bad or anything. I'm guessing hackernews commentors tend to be skeptics and are tuned to poke holes? But clearly it was posted based on some apparent merit. Other reactions would be totally normal too, like "oh wow, that's really impressive. I didn't know this existed." Or how so much of the real world has been modeled in minecraft (archival libraries, computers using redstone, etc.). Or noting what works they consider worthy of entry in the library.