Black Widow is Thaddeus Ross’ fifth MCU appearance, following The Incredible Hulk, Captain America: Civil War, Avengers: Infinity War and Avengers: Endgame. His pop-ins during the latter two movies weren’t anything more than cameos, so with Black Widow, I was hoping that he’d have a substantial presence in the story. Yes, Taskmaster, Dreykov and their brainwashed Black Widows served as the main antagonists, but it would have been great to see Ross serve as a side threat, specifically that his efforts to apprehend Natasha Romanoff for violating the Sokovia Accords would interfere with her mission.
Article source: https://www.cinemablend.com/news/2570391/black-widow-marvels-mistake-whiffing-important-character-thunderbolt-ross-red-hulk