I appreciate your frustration. Thank you for helping so many people on WikiTree.
Adding a history item for each Trusted List addition would crowd the system significantly. It would be a lot of data, and it would make Activity Feeds difficult to use in various contexts. For example, we only send up to 100 changes in the weekly e-mail update.
I think we'll need to develop a separate system for tracking and monitoring TL additions. That won't be easy, though, so if it can wait we'll be able to work on other priorities.