> the proposal from tauri is to run majority of the application in JavaScript / HTML ecosystem
That's a decision the developer has to take, but I'd rather see it as the opposite: the sensible approach is to run just the UI related things in Javascript, and run almost all of your business logic in Rust.
That's how I use it too, mostly because I personally find JavaScript and typescript frameworks harder to use than rust. Managing data in js is hard for me without static typing. Everyone will have different comfort levels but I agree, business logic in rust, front end in js is a great separation.