This is exactly what you’re implicitly asking for: deferring functionality to the OS. It doesn’t give the browser access to your camera (despite the title), it

This is exactly what you’re implicitly asking for: deferring functionality to the OS. It doesn’t give the browser access to your camera (despite the title), it allows the browser to facilitate uploading a file produced by the camera. To the browser it’s no different than any other file input, which was standardized in HTML 3.0. To the OS, it’s not meaningfully different from opening a file picker dialog. To the user, it requires direct interaction to invoke, and while it can be abused it has the same limitations as any other file input, i.e. nothing is uploaded without further affirmative action by the user. This is much better than the JS standards which give sites the power to request interactive access to the camera (after asking permission).