One problem with Tauri is that it doesn't bundle Node runtime, meaning that you can't take advantage of the npm packages that works outside of a browser environment. It does allow you to use Rust packages, but that's another story than Javascript.
Yes. As a user, I’m rooting for Tauri, but as a developer, I could probably build my app faster using Electron. Unfortunately, past experience tells me that companies usually optimize for ease of development instead of performance, most of the time :(