After years of pursuing new devices to extend the broad reach of apps, Apple now implores developers to go deep.

After last month's Google's I/O conference, I wrote about how its announcements followed a theme of lowering barriers, such as not requiring a separate device for Android Auto, or a PC for advanced virtual reality, or even installation to experience an app. While Apple also announced efforts to make app development child's play at its Worldwide Developers Conference (WWDC) keynote on Monday, it focused more on embedding apps deeper into the fabric of the core experiences that make up its emerging uberplatform.

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