Convergence is one of the technophile holy grails, rather (which I am not). Also, as a designer, I'm quite confident saying that without tech-so-good-it's-magic, you're allways going to have to make compromises in device interfaces, be they so minor, to add features. And that can, and does, cascade.
It's also entirely inapplicable in many cases... for anything dealing with, say, kids. You want cheap, robust single-use devices which can be replaced for a low outlay, there. Heck, for giving to many adults that's a better idea.
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