The category folders reorganize themselves based on usage
The App Library does not just sort alphabetically -- it groups apps by usage patterns and puts a small tile of the most-used apps near the front of a folder, plus a dedicated Recently Added folder for anything installed lately. Because that sorting updates automatically based on actual usage, there is no need to manually maintain folders the way home screen folders require.
Where new apps land can be set in advance
Under Settings, then Home Screen, choosing "Add to App Library Only" keeps newly installed apps off the home screen entirely, placing them straight into the App Library instead. This is especially useful for anyone who wants to stop the home screen from growing more pages over time.
Frequently Asked Questions
If an app is deleted from the App Library, is it gone completely?
Yes -- deleting an app from the App Library removes it entirely, the same as deleting it from the home screen. To just hide it from the home screen while keeping it installed, move it to a different page instead of deleting it.
Do newly installed apps skip the home screen automatically?
Only if set up that way -- under Settings, then Home Screen, choosing "Add to App Library Only" keeps new apps out of the home screen and places them straight into the App Library.