There’s only so much you can do with pointing and clicking on a flat screen. To me, part of the problem is that most non-mobile OS’s still haven’t embraced touch as part of the UX. Hopefully, there’s more inroads with “spatial” computing too.
Indeed. Back in the days when people thought light pens were cool[1], "gorilla arm" was a common term for the way your body felt after using one for a while. I doubt it matters much whether you're using a pen or your finger, in terms of the fatigue that develops.
Ha! Just checked, and "gorilla arm" is still apparently in use.
https://www.techopedia.com/definition/31480/gorilla-arm
[1] Edit: Some say that what really killed off light pens was company lawyers freaking out over the idea of Junior using a pointy stick on a fragile glass CRT with vacuum inside. Definitely something that could go wrong in a big way.