Ability to report on questions and their answers and posts and their comments/ likes/ etc in a way that connects corresponding questions and answers or posts and comments. Right now, each item is separate in the Collaborations Activity report, so you can't tell what was an Answer to which Question just from that report. You'd have to find that post/comment and look, which is time consuming.
Also, the ability to report on likes, comments to posts, answers to questions, best answer voting, and upvotes. There is no way at all to report on best answers and upvotes.