Avengers: Infinity War: Why we didn't see Thanos' epic 45-minute-long deleted scene

"Avengers: Infinity War" originally contained a 45-minute sequence of Thanos taking the Power Stone that was unfortunately cut from the final film.
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Avengers: Doomsday Will Replicate Avengers: Infinity War's Opening Scene According To Marvel Theory

After seeing The Fantastic Four: First Steps, I have crafted a theory that Avengers: Doomsday will repeat Infinity War's opening scene. Avengers: Doomsday's MCU story has been well and truly teased ...