This question is about suppression of threads of comments by moderators, moved to chat with the message "Comments are not for extended discussion; this conversation has been moved to chat", with link to the chat.
A recent example is this post.
I'm not addressing the case of polemical comments or disputes moved to chat such as this question, or deleted.
My impression before the moderator election is that this has been done quite too often on MathStackExchange, and was quite happy that this kind of moderation is performed... with moderation (only with very large number of comments, selective choice of comments moved to chat). I find the comments as being part of the MathOverflow reading. Is a more severe way of acting really needed? What are reasonable criteria to move a comment conversation to chat?
In the above example, first there is visibly a problem with the question in view of the vote balance, and, second, reading comments (now moved to chat) is instructive. I would really see a severe streamline of the chat conversations as a deterioration of the site.