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4K Chromecast with Google TV sequel is coming with new remote
(9to5google.com)
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Apple TV doesn't allow any customisation at all, Android is definitely the lesser of two evils with smart TVs. But really just get an external monitor connected over something like DisplayPort, running whatever OS your computer runs, for much more flexibility. There's no need for a TV to be running its own OS, and it usually just makes things more complicated.