I work on a 20+ year knowledge base for a big company that has had no real content management governance for pretty much that whole time.
We knew there was duplicate content in that database, but were talking about thousands of articles, with several more added daily.
With such a small team, identifying duplicate/redundant content was just an ad-hoc thing that could never be tackled as a whole without a huge amount of resources.
AI was able to comb through everything and find hundreds of articles with duplicate/redundant content within a few hours. Now we have a list of articles we can work through and clean up.
All of it.