So trying to play Skyrim, Zelda on the go/mobile would and should give you a 3 hour battery life.
Playing hand-held type games should give you hand-held/tablet battery life.
If you were to take your PS4/XB1 out of the house it would be clumsy and near impossible. You need the console, brick, controllers, TV/Monitor, outlet, etc.And not to mention some suitcase type custom carrying case to lug it around in.
This with just an AC adapter solves all. Earbuds which everyone already has, the controllers built in/stored, local play type software built-in and good to go.
You couldn't do a 360/PS3/XB1/PS4 on a plane, in a mall, on a bus/train, in a car, etc. as easy as the switch setup.
This is not replacing 3DS or next hand-held system.
So the switch is a home console with mobile ability not a mobile with console ability.