Windows or macOS? It isn't going to compete with a twiddled Linux distro.

Use mouse-heavy programs like DAWs, Photoshop et al? You're going to have a bad time in those mouse-heavy programs if all your cursor usage is with arrow keys, getting further and further away from the speed-of-thought.

If all someone does is lurk the CLI and their IDE, great for them, they'll probably love it. For the average schmoe or digital creative, not so much.

Equally though, I do a good chunk of my computer usage with just a keyboard, but the right tool for the task is required for anything else, e.g., MIDI controllers, mouse, graphics tablet, touchscreen, TrackPoint, trackball etc. They're just options. Pros and cons to all of them.

The "extermination" mentality is an extreme view, and inherently very niche. That's without even getting into gaming, or users who do game dev.