Webgpu makes sense for anything that needs to render quickly or that needs a lot of control over how things get rendered.

A slideshow program with custom font rendering & line wrapping and nice shader based transitions between slides for instance.

Even something like a terminal/tty is much nicer when it renders at > 60fps with smooth scrolling. Very hard to do with DOM nodes.

Because of the web a generation of programmers has forgotten how fast and responsive applications can be. Webgpu can make the web feel fast again.