In this answer, the entire comment thread was moved to chat and then later there were more comments which were deleted with the comment "respect the move to chat." It seems like the presence of a few chatty comments by a user or two is all it takes to completely and permanently remove the comment section from a question or answer. Shouldn't we only move "chatty" comments to chat and keep the ability of users to make constructive comments on a question or answer? The obvious downside of chat being that highly voted constructive suggestions for improvement on a question will be hard to find in a long stream. What I am looking for is reasons for a blanket and permanent rather than a selective movement of comments to chat.
Note: I agree with the decision to move the referenced answer's comments to chat in the first place; it did get chatty.