Tauri is a cool alternative to Electron and NW.js and it uses the OS Webview to make web based apps and package them in very very small file sizes
It's basically exactly what Ashley proposed to the NW.js team here:
But it's built and maintained by a different team of very talented developers.
Since Ashley proved to be interested in such an alternative, and that one already exists and is compatible with Windows, Mac and Linux (and is getting updated to support more and more native APIs via special Tauri calls) it might be a very good experimental export option for C3.
Integrating large third-party frameworks such as NW.js, and probably also Tauri, involves a lot of work, and adds a lot of complexity, which inevitably results in bugs, and additional maintenance problems having to report bugs via an additional third party. In r237 we added our own lightweight Windows wrapper, and in r242 we added our own macOS wrapper, based directly on the system webviews. These are very lightweight with a tiny file size overhead (~300kb or so compressed), which is even less than Tauri. Given the amount of work involved to integrate new export options, and the fact we already have our own lightweight desktop export options as well as a more heavyweight and feature-rich NW.js export, there seems to be little to gain from integrating yet another desktop export option, and a great deal of opportunity cost as this would use up a lot of our limited resources.