Engage and converse with others strictly about the post they have authored.

I definitely agree with your first point about being consistent, but I disagree with your second point, at least to some extent.

I know some users are likely to prefer to only talk about their specific post, and things that relates to that, but personally, I think engagement (the comment sections) are perfect ways to engage, come up with new ideas and share knowledge and experience, so I see articles in more like a 'gateway'-fashion, a gateway to more engagement, something that leads to things outside of the specific articles.

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