I'm on my lunch break from working on a React Native codebase, and I wouldn't say RN fits that definition at all... but I think we're just getting lost in semantics.

My point was just that a web app running inside a browser has to abide by the rules and limitations set by the browser, whereas Electron flips that relationship -- your app sets the rules and limitations of what can be done, and the web rendering process abides by whatever environment you create. You can do anything the OS permits. Even from inside a web context, if you want. You don't need a browser-managed sandbox to mediate your interactions with the OS.