Ask HN: Why lock down the YC job postings?

Here's my personal opinion on the matter: I think it'd add some value to open up comments on these postings to field questions. I don't get warm fuzzies from the closed garden that is YC backed company job postings displayed on HN intermingled with all of the other upvoted postings. Given their current implementation, they function very much like sponsored ads in a twitter stream. I entirely understand why they're there, but I'm just a little biased that we're unable to comment.