When the deleted scenes on the Avengers: Endgame Blu-ray were revealed, one that the internet really liked was the one where all of the Avengers reenacted the Mulan ending and kneeled before Tony Stark.
The Russo Brothers are currently doing an AmA (Ask Me Anything) on Reddit, and they discussed why they cut the scene:
“We found the Avengers kneeling scene incredibly emotional as well, but when played in the run of the film, it felt incredibly similar to the moment when all of the heroes stood on the shore at Tony’s funeral, paying their respects to him outside his home. The two scenes, when in the film together, seemed to fight one another, and created a repetitious ending.”
So taken out of the larger context of the movie, the scene is good. But as they explain, when shown with the funeral scene it just makes the ending of the movie a bit too much on the mourning.