Only duplicates.
For my own practice, I’m with Tikhon. I view comment deletion without due cause with acute distaste. I won’t do it, and I resent it when people do it to me.
It can be argued that such a sentiment is a result of privilege. Clarissa Lohr had a good articulation of the opposite perspective: https://www.quora.com/Have-you-e… . And she concludes with “It would be a significant loss for Quora if we restricted the answers to those that are up for public debate.”
For Quora in general, it would, just as it would be a worse place without the contributions of say Ernest W. Adams, who does not allow comments, because he’s on a Q&A forum, not Reddit.
That’s Quora in general. But my own choice (exercise of privilege though it might be) is to be reluctant to engage with that writer, or that kind of topic. I think I do have less to gain from an author who is not prepared to engage with me in good faith. And there are authors I avoid as a result.
There are shades of grey in between. I don’t like, for example, that Jae Alexis Lee deletes comments, and normally “I’m not here to provide a public debate forum” is a trigger for me to avoid the writer. But I like what she has to say; the one or two comment interactions I’ve had with her have been entirely pleasant; and of course the kinds of interaction she’s likely to block in advance are not philosophical debate, they’re the ten gazillionth rehash of content-free transphobic ickiness. So I’m OK to try not to let any libertarian distaste colour my view of her.
And I don’t comment much, because there are times it’s best just to listen. That’s OK too.