Gorilla arm really only applies if you have your arm extended the entire time (or simply "a lot"). With a touch screen laptop you'd a) still have mouse/kb input

Gorilla arm really only applies if you have your arm extended the entire time (or simply "a lot"). With a touch screen laptop you'd a) still have mouse/kb input so you wouldn't always be using touch and more importantly b) when you're not interacting with touch, your arm will be resting - i.e. you only extend your arm for a few seconds at a time and don't hold it there for long. I haven't experienced gorilla arm at all on my Surface (which I use in "laptop mode" often - for what it's worth I no longer use a laptop.)