How do you suggest web apps can be granted native app-like abilities, then, if not via a standardized browser API? PWA's are a thing, and arguably the future of app development (including wearable computers, the next big thing). If not: Least companies can afford to develop native solutions for every single manufacturer, granted there will be more than one. We'll be stuck with solutions like Cordova forever. A grim prospect on the future.
Another comment suggests bundled permissions for elevated apps, with a simpler prompt, if any. I think this is the inevitable way to go.