Chap 1 - The last quiz

Hello MongoDB enthusiast, in the last quiz of the chapter one, the question says : Which of the following are use cases in which you should model your data for performance rather than simplicity ? and in the detailed answers they said that “This is a substantial team, so it is likely that your project is not that simple”
is that logic ? does it mean that a product developed by many engineering means that it’s a huge product so we have to model for optimization ?
what about the fact that it’s developed by 100 engineers so that require simplicity for faster and smooth understanding of the team ?