What's the difference when you can (and presumably will) play it on your TV?
Because there is no discernible home console elements to this. The sources Eurogamer has point this to a handheld first and foremost with it running on a mobile chipset. As friend-of-the-site Syrenne points out in her twitter thread(I'm paraphrasing): you're either looking at a Vita-like 540p resolution on the handheld with an HD upscaler inside the dock, which means "great job! You've found a way to piss off devs even more!"(my words, not hers), or the handheld runs everything and can natively output 720p or 1080p and now you're looking at Pokemon Go levels of battery drain.
It's a compromise either way, and Nintendo's track record points to the former, meaning the console side gets gimped. And I'm supposed to believe this is the hardware that's going to run Breath of the Wild flawlessly?