Yes, and that's a much better mechanism. The question is: what does Signal do if it seeks an inappropriate permission and is denied? For example: Gallery, wh

Yes, and that's a much better mechanism. The question is: what does Signal do if it seeks an inappropriate permission and is denied? For example: Gallery, which is the default picture viewer on the Samsung GS5, at least. They updated it to demand several unnecessary permissions, such as for your Calendar. Clicking on an image (invoking Gallery, in its most basic instance) results in a prompt, "Allow Gallery to access your calendar?" If you Deny Calendar access, it exits, or crashes.