[account73466]

On HN people often do not reply on replies to their comments and it does not mean that they do agree.

It seems like a rather nice thing which helps to avoid many ego-battles.

[Apocryphon]

Not to start an argument, but that could also be because HN doesn't automatically notify you of replies. I'm subscribed to the email notifier, but that was created by a third party and I doubt if a majority of the users know about it.

[account73466]

It contributes as well.