Earlier quoted context omitted.
I would say for me, the killer app would be just about anything you might reach for Electron with, but want a much smaller install footprint. Tauri in and of itself is pretty cool, kind of a lighter alternative to electron using native platform browser engine. In general, I would probably reach for Rust if I needed to do anything wither Web-Assembly (wasm) as the path to working is much nicer than other languages imo…
Tauri might be cool in theory, but Hello World consumers TWO POINT EIGHT GIGABYTES of hard disk on my machine. Arguing "Rust has no dev speed penalty" in that context is just... no. You are damaging your own cause there, because all advocacy becomes laughable.
From another response, their Windows installer is under 7mb, and much of that is MSI boilerplate.