You've contradicted yourself - you say the Switch isn't that portable but according to you Nintendo loves to create new products at their "own detriment". Are you arguing for or against the Switch?
The problem is you're comparing the Switch to the 3DS, but if Nintendo were going for portability, it's pretty damn obvious they'd release another DS instead of the Switch.
The Switch is about offering a unified gaming experience for players who want the depth of a console experience anywhere they'd like without carrying the console, so yes, the Switch is still very portable in that sense. The Switch is bigger than a 3DS but is still smaller than a laptop so I don't know where your "not that portable" argument comes from.