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"This scene was supposed to be in 'Avengers: Infinity War' after Thanos snapped his fingers," said co-director Joe Russo on the film's commentary. "We thought it might be interesting to cut to a verite scene between Hawkeye and his family."
The Russos thought it was too disorienting and busy to have at the end of "Infinity War" when they were already cutting between people disappearing in Wakanda and in space. The start of "Endgame" wound up being the right fit for the scene to remind viewers what happened at the end of "Infinity War" and how they felt.