Contacts Picker API: https://developer.mozilla.org/en-US/docs/Web/API/Contact_Pic...

Hardware APIs: There is of course a good reason why websites don't get unlimited access to those APIs (and why they can't access them in the background). But Bluetooth and USB are both available on Chromium browsers on every platform except iOS (because Chrome on iOS is Safari).

Example: When Google closed down Stadia, they offered a way to unlock the Stadia controller so you could connect it via BT to any computer and use it as a regular controller. You just went to their website, hooked up the controller via USB, and the site would update the firmware on the USB device.

But sure, there are many use-cases for native apps. Also, there are many native apps that should just be a website (you shouldn't even need to install it if you only need to use it once or twice).

If you open the link that you shared you may realise that the API is so unsupported that you can't build any production application on top of it.

I was not denying that not every app needs to be native -- I was replying to a comment asking for what is not supported.