To understand why this specific file format is popular, you have to look at the video compression and resolution standards used:
This confirms a surround sound setup, which is crucial for a movie where the soundtrack (featuring hits by Kenny Loggins and Deniece Williams) is a main character.
This is the codec used to shrink a massive 4K file into a manageable size without losing much detail. It’s significantly more efficient than the older H.264 standard.