I think you are making a category error here by assuming we will need to use the new tools the same way we use our existing tools. 3D is different and that inc

I think you are making a category error here by assuming we will need to use the new tools the same way we use our existing tools. 3D is different and that includes working with 2D things in 3D digital spaces. Working with 3D things in 3D is a natural fit but you are correct, that is a limited problem space. Working with 2D data but where you have a surrounding 6DOF 3D/360 Infinate canvas of possibility provides elbow room to reimagine and improve each of the experiences you list in ways you can't have with physical screens, a keyboard, and a mouse where every feature delivery system is constrained by 2D structural tolerances. Not that PC computing will become obsolete at all; XR will find a place to add a new layer of interactions that complement the human digital partnership in much the same way as the introduction of mobile computing provided in its own way.