For the former ("programming"), there are many commands that can be used to rapidly output code. For example, a user can say "funky hello world" to get something like

function helloWorld() {

}

But if you're trying to edit code that already exists, it can be a challenge to do so without a mouse and keyboard, in part because you need to do a lot of navigation.

I personally believe Cursorless solves that problem better than a keyboard and mouse, but I have to imagine I'm a bit biased on that point :)