We are using c++ mainly because Qt/QML exists. I guess if a Rust gui toolkit exists that is comparable to Qt/QML (looking at you https://slint-ui.com/), then future project would have to be re-evaluated.
My plan is to use Tauri in Rust likely with just the view in TypeScript (will probably move state into Rust). No, it isn't Qt/QML and HTML/JS/CSS aren't as snappy or memory efficient, but with work they can be made reasonable and bonus is styling is endless.