I figured this is the best place this should go. Not really a missing feature, but probably something that should be taken care of anyway.
One of the Community Coordinators or Admins (probably community coordinator, I'm sure the admins have enough on their hands and it seems like more of a community coordinator thing to do) should go through the Forums Tutoral/FAQ forum and update/remove some outdated threads, such as the policy regarding custom user banners thread, forum tutorial with the screenshots from the old forums from Mosley, introduction to the blogs system, etc. since those features/layouts are no longer available. Some should just be removed, but things like the Forum FAQ I'm sure someone could go through and update appropriately with the same information using the new forum software.