I think that Apple or any company making operating systems should display an even amount of 16 apps in home screen tabs, app folders, and app menus on iOS, tvOS, and other operating systems, instead of the hard to organize and odd amount of 9 apps.
What
- Display 16 apps in folders, or alternatively 24
- Grid of 4x4 apps in folders, or alternatively 4x6
- Always show an even amount of app columns
- Always show an even amount of app rows
Why
- Grouping apps in groups of 2, 4, or 6 makes sense logically
- With groups of 4 people can easier create a mental model
- Rotating from portrait and landscape shows the same apps
- People may be buying or using less apps with folders of 9