This is what I thought at first until I dove in more. AFAIK, Tauri makes it possible to write your ENTIRE app in Rust _EXCEPT_ the view. This means you can take events and send them directly to Rust for processing and vice versa. While porting an existing web app might not use any Rust, someone using this to specifically create a Rust GUI app can use the HTML/CSS/JS portion as just a view for their Rust app for the most part.