If that were the case, why aren't all of the other Disney shingles (Marvel, Pixar, Disney Animation, 20th Century, etc.) experiencing similar issues on nearly every project?Is it possible that Disney is a/the source of mismanagement?
The untimely death of Carrie Fisher was an unforeseeable bit of bad luck. Everything else is something that management can and should have anticipated.
Marvel has had directors not work out -- Edgar Wright prior to Ant-Man, Scott Derrickson prior to the Doctor Strange sequel, as two examples. But Kevin Feige makes sure Marvel Studios and the creative team are on the same page much earlier in the process, so that if the collaboration doesn't work it has much less impact on schedules and release dates.
The Force Awakens is actually the one project I don't fault Kennedy for. Given the constraints of the Disney acquistion, it's a miracle that it turned out as well as it did. I give Lucasfilm a lot of credit for relaunching the brand with a movie that brought in over $2 billion worldwide.
But Trank was already in the middle of shooting Fantastic 4 when Lucafilm hired him. It seems like it would have been easy to ask around town about how that was going before extending an offer.
Gareth Edwards ran into nearly identical issues with Godzilla. The reason they knew to bring Tony Gilroy in to right the ship was because Warner Bros. had previously brought Gilroy in to right the ship on Godzilla. Again, issues that a reasonable amount of due diligence prior to hiring should have uncovered.
Lord and Miller's style of making movies was well known around town when they were hired. If fidelity to the Kasdans' script was the priority, they should have known better than to hire them for that movie.
Up until a couple weeks ago, I would have agreed with you about Trevorrow. But the leaks indicate a movie that would have been at least as flawed as Rise of Skywalker ended up being.