Why would it run any different than a normal Switch? Even if it's running a newer, lower process Tegra, docking it won't change much. All we know that this cuts down on, to cut costs, is removing the hardware for detaching the joycons, removing the HD Rumble, using a smaller screen and ditching the TV out, which is literally a software thing.
Right, and those being extra, in this case, is fine. If it's about choices, let me choose to go with a purely handheld one like this that I can then buy a dock, extra controller, etc for. Or entice people to buying a second switch that already works with their existing equipment. I have 2 docks as it is and this would be an easy, cheaper family edition (and addition) for me. Hell, I'd buy a dockless Switch for $250 for that, alone, if they decided to market it that way at some point.