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Mobile hardware continues to increase in power, and innovations such as SlimPort and MHL and USB Type-C have all in one way or another helped to ameliorate the connectivity and battery issues.
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Things have been changing on that front, of course. There weren't good enough ways to connect and display the smartphone's contents on a larger monitor. The apps weren't sufficient substitutes for desktop software. The mobile hardware wasn't at all powerful enough.
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There have always been severe limitations, though.
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