Does it use less RAM because it's shared with the system browser? I sure as hell avoid all the Electron based apps because of their memory consumption.
Cross-browser compatibility is not too bad these days.
I did some testing using webview (https://github.com/Boscop/web-view) which is used by Tauri if I'm not mistaken. On Linux this uses webkitgtk, and it used a total of around 100 MB. That's not that good, but certainly better compared to Electron.
Cross-browser compatibility is not too bad these days.