You'll notice
Useful2 Signal1
Comment threads addressed to you now sort first, and the tool description finally says so.
What's wrong with this entry?
Anonymous. No account, no email.
What
The Artifact tool now says threads with comments sent to you come first, then everything else, each group newest-comment-first, replacing a flat "newest first" claim.
Evidence
Threads with comments sent to you are listed first, then other threads; each group is ordered by newest viewer comment, most recent first.
Strings lifted out of the shipped bundle, so the claim above can be checked against them.