This would be a good time to remind everyone to read the book Masters of Doom. Such a great story of how these games came to be.
Of course this is a very different book: it includes detailed reviews of the engine's source code, and translates complex concepts with ease. Plus the print edition is beautiful and colorful (which is a must for a game book).
[1] https://www.amazon.com/Game-Engine-Black-Book-Wolfenstein/dp...
The creatives meanwhile rebell against the final say they never will have in such a project, to avoid it beeing burried by daydreams.
This is what a good manager actually does- keeping a volatile mixture of people detached just enough to avoid a catastrophe - and close enough to harness all the beneficial reactions. Like a force field contained fission reactor on leg.