Let’s use the obvious example of a paint program. Clearly continuous 2D pointer input is an essential feature that would be almost impossible to replicate with

Let’s use the obvious example of a paint program. Clearly continuous 2D pointer input is an essential feature that would be almost impossible to replicate with only a keyboard. To step back a few levels, a node graph editor with many elements will simply always be easier to interact with using a mouse. But editing text and interacting with other applications such as visual debugger are really only a tiny bit removed from that.