capableweb parent
No, because Electron embeds Chromium/Chrome, Tauri uses whatever the platform already has.
Correct, but for the Tauri/Servo combination, you need Servo which is unlikely to be already available. Stripped release builds of servo are currently 106M which is quite large. Hopefully some size reduction will be achieved.
Why not a PWA? Does your app need more permissions to mess with people's system that a PWA would allow?