One director walked, causing a slight delay. That’s not a revolving door, and many big budget films have been killed by that. EON fixed it incredibly quickly by comparison to other films that have run into it. In regards to script troubles, we have rumours from common click bait sources denied by more reputable sources like variety.
People generally - I know film financing and release date delays to maximise profit are very dull subjects, that happen all the time, but let’s not encourage tabloid trash by trying to make the slightly slower rate of Bond movies more interesting than it is. I’m getting sick of seeing this nonsense, especially as MGM’s silence over its future as a company beyond Bond 25 (and I mean for ALL films, not just Bond) suggests we’re in for many more of these delays for Bond 7’s tensure.