@JMarkOckerbloom my favorite example of this: https://www.ign.com/articles/2001/11/12/deus-ex-2
"'There's a tendency among the press to attribute the creation of a game to a single person,' says Warren Spector, creator of Thief and Deus Ex."
Not only did the original Deus Ex walk away with our own Game of the Year Award; it even managed to snag the same honor from our readers. By all accounts Warren Spector's open-ended take on action and role-playing games was a huge boost for the industry. The fact that it was set in a dark, conspiracy-laden context didn't hurt either. Now Warren Spector has moved out of the project director's chair in deference to Harvey Smith, the lead designer from Deus Ex. Warren's taking a bigger role in overall studio development now. Although he still gets his hands dirty, he's spending more and more time trying to cultivate teams that can work on different games simultaneously. He sees the studio as the source of several new immersive games -- games that don't hardcode solutions to every situation. Warren's dream is to create a game that functions very much like real life. In other words, he wants to simulate worlds, not puzzles.