Recently, Marvel fans have found out the reason why the MCU movies have been going through creative differences or arguments behind the scenes. The Marvel Creative Committee is supposedly the group responsible, as they were a group that many Marvel movie directors have had falling outs with, including the team behind Captain America: Civil War.
The Marvel Creative Committee was a group that gave notes on Marvel Cinematic Universe movie productions during the development process. The committee supposedly consisted of Marvel Comics writer Brian Michael Bendis, former Marvel Comics editor-in-chief Joe Quesada, Marvel Comics publisher Dan Buckley, and president of Marvel Entertainment Alan Fine. On paper, this sounds like a great idea, as they'll in theory keep the source material or inspiration intact so things don't go wrong to anger fans. In practice, they became a roadblock for many filmmakers. James Gunn said that they wanted him to ditch the '70s soundtrack in the Guardians of the Galaxy film and gave him notes that "negatively impacted the 'messy plot villain stuff'" with Ronan. The creative committee was also a reason why Edgar Wright left Ant-Man before it even started filming.
The Creative Committee almost ruined many other movies besides those two. They also didn't want a Captain America: Civil War fight between the Marvel heroes (despite it being based on a storyline that originated from the comic books). The Marvel team initially had to write a draft where the heroes were teaming up against five super soldiers instead of the climatic and well-received ending where Tony Stark and Steve Rogers battled each other. What fans got is a better alternative. The dissolution of the Marvel Creative Committee in 2015 was due to Feige's executive shakeups of the Marvel Studios structure.
Feige reorganized it so he no longer reports to Marvel CEO Ike Perlmutter. Perlmutter has a background in the toy world and the authority he had is the reason why there weren't as many Black Widow toys because he wrongly believed that girl toys do not sell. After Feige vented to the higher-ups, Perlmutter no longer was in charge of Marvel Studios (the film side of Marvel) and now Feige reports directly to Disney studios' head chief. After the Marvel Creative Committee was dissolved, the next four MCU films were developed and created without any external input. This is why the films did very well and implemented creative changes to the characters (Guardians of the Galaxy Vol. 2, Spider-Man: Homecoming, Thor: Ragnarok, and Black Panther).
If the committee was still intact, there's no telling if Avengers: Infinity War would've ended the way it did. Even for Black Panther, Ava DuVernay was offered the role of director but then walked away due to not being able to have her own vision, and this was during the time when the committee was still in place. Thankfully, this is no longer in effect, as it's a shame that there's always a battle between creatives and higher-ups. Hopefully, no new group steps in to replace what was rightfully lost.
One thing should be noted though, with the continued success of Marvel movies fans are noticing a diversion from comic book accuracy. Some can make the case that a lot of characters who were powerful in the comic books aren't seen as such in the movies. Drax the Destroyer and Vision, for example, have been 'nerfed' down to a very weak level despite both being incredible forces to deal with in the comic books. Moving forward, it would be nice to see Marvel keep the humor without sacrificing the power scales or integrity of the characters.
Captain America: Civil War is now available on Disney Plus.
Source: The Story of Marvel Studios: The Making of the Marvel Cinematic Universe (via Slash Film)