Lincoln was in development hell for so long Liam neeson told Spielberg off.
After working with Lucas and Spielberg he must have some stories to tell, horror stories,lol.
You work with moguls that big and ego will be an issue.
Though i do respect Kathy and Frank's work at Disney with the works of Miyazaki and studio Ghibli. I completely disagree with their backing Lucas destruction of the oot. But so does Spielberg even though he thinks films should be released untouched now, weird.