The Kang Dynasty will be the first part of the culmination of the Multiverse Saga, as well as the first Avengers movie since the huge success of Infinity War and Endgame. The expectations for the film are high, so it’d make sense that Marvel would give themselves a bit more extra time to perfect things. It was always a hard ask to top the widely anticipated Infinity Saga, putting MCU Phase 4 on the receiving end of criticism. With it being the phase that the studio introduced canon Disney+ shows into the MCU, Phase 4 ended up being a mash-up of individual projects that carried into the beginning of Phase 5.
Marvel has arguably hit a high again with the quality of Guardians of the Galaxy Vol. 3, so the studio will want to make sure they can maintain this quality going forward. Marvel will definitely make the most of the extra time on the delayed MCU movies, especially with the huge Multiverse Saga culmination of The Kang Dynasty. Whether the improvements will involve a recast of Majors as Kang the Conqueror in the MCU remains to be seen, but it’s not out of the question with Avengers: The Kang Dynasty’s whole extra year of production.