Regarding point #4, I think the clear winner is Tauri. I'll clarify --
While writing in Node is great if you don't know Rust, your users are being shipped an entire Node runtime, which has size, memory, and security issues. So in this case Electron has a "better" DX completely at the cost of the user.
Tauri has JS/TS APIs, but if you need to do extensive backend work then it requires some learning at the benefit of your users. After learning Rust myself, I'd say it's the benefit of the developers too, but that's just my opinion. :)
While writing in Node is great if you don't know Rust, your users are being shipped an entire Node runtime, which has size, memory, and security issues. So in this case Electron has a "better" DX completely at the cost of the user.
Tauri has JS/TS APIs, but if you need to do extensive backend work then it requires some learning at the benefit of your users. After learning Rust myself, I'd say it's the benefit of the developers too, but that's just my opinion. :)