Disney built a UI feature to apologize for its own content strategy. The green strip on Disney+ marks 15 titles as essential viewing before Avengers: Doomsday. Marvel has released more than 50 movies and shows since 2008. So Disney's own app is now telling you that over 70% of the universe it spent billions building is safe to skip. Look at what made the cut. Exactly one Disney+ series, Loki. Marvel made a dozen-plus streaming shows starting in 2021 because Disney wanted to flood the platform…