Generally, I think that a vouching queue looks like another way for people who like the sort of submissions that HN tends to flag to further promote that content.

I don't think flagging is creating problems in terms of HN's quality. As I indicated, there were lots of reasonable criteria under which to flag the previous post. To me, this post has characteristics that meet those criteria as well.

Where vouching might have a role is a quality story with very few points that is flagged dead based on misunderstanding or malintent. A story that hits the front page has had many eyeballs upon it and if it is killed from there by organic means, that's the way the system is supposed to normally work. Even when I think the story does not deserve it.