As much as I agree with the argument for QWERTY agaist Dvorak or Colemark as a default, alphabetical ordering seems more generally standard than even QWERTY. And in any case, when typing something on the TV the remote seems to be the real bottleneck.

I would go as far to say don't use on screen keyboards at all. Use an app. I know they have to have something for those who don't have smart phones but Chromecast is a breeze to use compared to every other smart TV I've had to deal with.
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