Many people fail to understand that portability does not mean you MUST play it outside. It rather opens up possibilites inside the house, too. That way, I can play in the kitchen while I wait for dinner to finish cooking without the need to switch (no pun intended) rooms. Stationary consoles don't offer that. And THAT is comfort.
You mean something like Wii U?
I don't give a damn about handhelds, but Wii U was actually nice idea...if only Wii U Gamepad was optional peripheral for those who actually want to play in kitchen or while taking a dump, and not forced on consumers.
Sony is giving you this option with PS4/Vita, nVidia is giving you this option with their cards on PC.