Bitcointalk was popular some years ago, but for now not all cryptousers and crypto-intersted people know about the forum, so new projects don`t need to creat ANN thread, because for now only website and investors names are really important for listings and next development. Bitcointalk isn`t in priority now
If Bitcointalk is no longer a priority now, why are you still in Bitcointalk by following the bounty project? Does the project that you follow don't have ANN in Bitcointalk? actually ANN threads are only for making some kind of information and announcements even though it can also be done on the project website and social media channels, but I think ANN threads will also not be bad if the team provides the same information.