Every time a new Android version arrives, a new game begins: Which of the lovingly described fresh platform features will fail to live up to its hype and then end up fading out of the foreground — either to be phased out completely or just brushed aside and consigned to oblivion?

It seems like a funny thing to say, but when you look back at Android's history, you realize how many once-transformative-sounding features ended up fizzling and being forgotten soon after their grand debuts. Some remain buried in the software while others quietly vanished after a period of inertia, but they all share the fact that they're nowhere near the center-stage-worthy elements they once appeared to be.

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