Webviews are less efficient than electron because electron integrates node and the v8 engine together, along with a number of specific patches and improvements

Webviews are less efficient than electron because electron integrates node and the v8 engine together, along with a number of specific patches and improvements meant for singular desktop use. You can't patch webviews nor change their behavior. Also windows webview2 is very alpha and currently not useful. No v8 access, very little configurability, and its not using any less memory. It will be years before it's ready. Chromium itself should have impliments webviews long ago.