It's also hard to ignore that they haven't released a FH in the time this has been in full production. I suspect that like everything else at MS, playground is now a mess.
Not to mention if you're making "Fable", that original design doc is basically multiple times the scope of Elder Scrolls. So good luck not letting feature creep set in. Actually, you don't have to worry about feature creep if you're going strictly by the doc, because it leaves no known video game feature out of the project. The fact Peter convinced thousands of adults and the biggest company in the world that such a thing was even remotely plausible is amazing. Go read some of the original interviews about the project. If you're a big wig at Playground, you're probably riding pretty high on the last decade. Thinking that your deft abilities as a big wig guided Horizon to the wild success that it's found. You're gonna look at that pitch and say "I can pull it off. All of it".