Earlier quoted context omitted.
>Obviously apps can tell if they haven't been granted a permission By design. This doesn’t need to be the case. It should be impossible to tell you have denied a permission. In TFA’s case, the browser could just keep processing audio but never hook it up to a real audio sink.
Soundd like a nightmare to build legitimate apps if you for example are building an app that uses the camera but you can’t in anyway tell that using the camera fails (because user had denied the permission 6 months ago and has no memory of it) and instead of being able to give a helpful error you are just ending up with I am guessing fake images (maybe just a black screen).
Just because it's hard doesn't mean you shouldn't try. What about a popup saying "xyz has tried to access the camera a lot lately, continue blocking?"? Or apps can apply for set of 'core permissions' that can't be denied but are much more tightly controlled? Apple and Google are some of the biggest companies in the world, they don't deserve as much leeway as you're offering.