You are definitely right that this sentiment is strong throughout the tech industry, so it's just by coincidence that it is strong on HN, however, it does define a strong position in voting behavior on HN. Even when there are reasonable arguments in support of non-open models (and I'm not saying this is one of them), downvotes fly and little discussion is had, it creates a feedback loop that reinforces an entrenched ideology and shuns opposing view points. I'm not making a value judgement about one or the other view, but it does affect how interactions on HN take place.