> I don't exactly see the benefit of adding Rust here.

From that perspective, there isn't any. Dyed-in-the-wool "QT app-devs", if there is such a category (KDE devs?) already have access to Rust libraries, in the same way they have access to most stuff in weird compiled languages: you wrap the library in a C ABI and call that. It's a well-understood process in QT land.

I think this project is more an effort to give Rust projects access to a native graphics toolkit (that happens to be QT) for adding a GUI to a previously CLI application. I could see, for example, the Parity Ethereum client (written in Rust) getting a native system-tray/notification-area widget written in QT.