One interesting usecase is that you can run a tauri app without any webview windows just as a system tray icon and only spawn a webview window when necessary.
This kind of makes it way more lightweight but only in some situations (obv. heavily depending on the functionality of the app).
Would this be for a service style app that happens to have a UI when you need to configure it? If so that's an... interesting idea, but considering the UI is less important I'd probably mind it less (as someone who is not a fan of Electron apps).