This distinction feels mostly a metaphoric and superficial difference in practice if the iOS home screen is considered a zooming UI because of how it visually p

This distinction feels mostly a metaphoric and superficial difference in practice if the iOS home screen is considered a zooming UI because of how it visually presents things. Interfacing-wise it doesn't feel like a significant difference if I consider the app switcher as an infinitely pannable canvas of apps I zoom into, or a stack of apps I scroll through and then open. It feels to me, instead of exploring different interfacing experiences in terms of zooming/non-zooming it might be more useful to think along the lines of structured/unstructured, contained/uncontained, or gestures/buttons for example.