Studio interference in the creative process

Being a business, Disney can’t really give a blank check to its directors and tell them to do whatever they want. Everything needs to go according to a plan, for bigger box office successes, which in turn will justify even more expensive and entertaining movies.
The most obvious move of this kind was when Edgar Wright had to depart from Ant-Man for the studio to make the movie fit into the MCU. And, not surprisingly, some were pretty upset when that happened – especially since it was said that Edgar Wright worked for a decade on the movie and he was responsible for the awesome pitch that made the film happen.
But it all worked out, and Ant-Man became a success at the box-office and with the critics.
The second example is Joss Whedon, after Age of Ultron. And the movie turned out well enough to justify its big budget. And, quite frankly, there was no better introduction of a secondary character in the MCU than that of Scarlet Witch.
So why should anyone be upset? We had Civil War afterward and the Infinity War promises to be even better and bigger!
This being said…
