I do think that there is a distinct difference between sounds that you can hear and sounds that you can't (where the line is is blurred between people, and even

I do think that there is a distinct difference between sounds that you can hear and sounds that you can't (where the line is is blurred between people, and even loudness@frequency for a person, of course). When you give permission to an app to produce sound in your environment you were probably assuming it would do only one of those in particular. I think it's perfectly reasonable to need permission to produce sound that you cannot hear. It should be a fairly rare permission anyway.