We make mobile app development easier by narrowing the product down to the high-value actions users need most often, then designing for reliability across real devices instead of only one ideal screen size.
Android’s adaptive app quality guidelines are explicit that apps should support multiple form factors, configuration changes, and responsive layouts rather than assuming one narrow phone view. That is a useful standard even when a business app starts on mobile first, because customers increasingly move across phones, tablets, foldables, and desktop-windowed contexts.
Those same guidelines also emphasize continuity during configuration changes and appropriately sized interactive elements. In practical product terms, that means the app has to remain understandable and usable as screens resize, state changes, and users return to a task after interruptions.