Given that it keeps comments that are replies to other comments nested under the comments that they’re replying to, I suspect that that only makes a difference when one comment has two or more replies. It’s much more common for a comment to have only one immediate-child-level reply, in which case it seems that the sorting doesn’t make any difference in how that reply is displayed. So it’s useful in some situations, but not in the majority, hence ‘not very useful’.
You can already “Sort By: Controversial”
That’s not very useful for comments that are replies to other comments, though.
It sorts those too, tested it.
Given that it keeps comments that are replies to other comments nested under the comments that they’re replying to, I suspect that that only makes a difference when one comment has two or more replies. It’s much more common for a comment to have only one immediate-child-level reply, in which case it seems that the sorting doesn’t make any difference in how that reply is displayed. So it’s useful in some situations, but not in the majority, hence ‘not very useful’.
For the clueless among us: how?
http://i55.tinypic.com/2ey8go4.jpg
Never have I been so thoroughly owned in so few characters.
He could do better.
http://is.gd/fjEp7 is 16 characters shorter.
Lo and behold, I am enlightened!
I hereby change my previous suggestion to “let users see a total of how often they’ve been upvoted and downvoted in total”