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Why don't tablet makers include HDTV tuners, and HDMI inputs?

For minimal extra cost, your tablet would be much more flexible, and have a vastly longer useful life-span.

Just imagine that your beloved tablet could double as a computer monitor. That would be a killer feature for any techies. Adding that capability to a laptop costs over $300, and people are happy to pay it: http://www.amazon.com/dp/B002CLKFTQ/

And once your tablet gets to be a bit out-of-date, instead of throwing it away, you can just mount it on a wall connected to your antenna as a (free) 10" HDTV. And a very "smart" TV it is, at that, able to integrate Netflix/Hulu/etc. streaming without needing an extra $50 Roku/Chromecast box attached to it.

Or if you don't have a need for a small TV, it can go on your desk, doing duty as an LCD computer monitor. Heck, you could use it as a computer monitor right away, and just have the option to use your monitor as a tablet for quick tasks without starting-up your noisy and power-hungry main computer.

And that's not even mentioning the benefit tablet users would get from having a handy HDTV tuner with them all the time. In most cities, an internal antenna is good enough to pick-up several TV channels, so you'd have lots of free content available whenever you wanted to watch, without the need for high-speed internet access for streaming the video. Of course there's always the option of connecting a larger external antenna, even if just a long piece of wire yu scrounged up, in reception-poor areas.