'Avengers: Endgame' screenwriters wanted to deliver satisfying conclusion

One would imagine that as the screenwriting duo of Christopher Markus and Stephen McFeely began to tackle their sixth and, for now at least, final film set in the Marvel Cinematic Universe, "Avengers: Endgame," they would've walked into the assignment with all the swagger of Tony Stark, or the resolute righteousness of Steve Rogers.

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