Even with his clarification, I think the distinction does matter between authentication and authorization, because "who I am?" will result in different answers

Even with his clarification, I think the distinction does matter between authentication and authorization, because "who I am?" will result in different answers to "do I have permission?" depending on the context. Location, time, etc. all play a role: I can drink in the bar at 10pm, but maybe not at 2:01am after they close, and probably not in church.