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There are two main reasons, the first is that "Avengers 3: Infinity War" actor Chris Evans (Chris Evans) and the Marvel movie labor contract is about to end, and Evans himself also stated that Avengers 4 will end His Captain America acting career. The second is based on the development of the death plot of "Pride and Prejudice" in the "Infinity War" comics, and the signs also reveal the signs of Captain America's sacrifice.
Downey is in a similar situation as Evans, who has previously hinted at retirement, also confirmed that Avengers 4 will end the cast of Iron Man. What we cannot deny, however, is the huge impact of Iron Man's death. As the last protector on earth, death will be a noble way. In the film, Iron Man will have a life-and-death contest with Thanos, which can be regarded as an official curtain call with fans.