As a user, so many of these I wish did NOT exist. E.g: Push Notifications, Banners, Web Share, Contacts, Page Visibility, Badging. Uncertain about USB, Bluetooth, Locks, Keyboard Lock, and Native File System. I don't want my browser doing those things.
Then you're out of step with what users want these days. Nothing wrong with that! But to take an example, when I hit a share button on a page I want to see the native share box, not some hideous iframed monstrosity that only works with Facebook. So I want Web Share. And I don't want to download an entire native app just so that I can receive a push alert when my food order is on the way, a web site works much better…
Why would the share button be on a page? Surely this should be a native browser/OS function (as implemented km android, for instance)