One possible reason to downvote is that the question was the top comment for this post, but it does not directly discuss the new technology introduced in the po

One possible reason to downvote is that the question was the top comment for this post, but it does not directly discuss the new technology introduced in the post. I don't know how HN ranking works, but I'd assume that the top comment to a front-page topping article has already collected a sizable share of upvotes.