I can draw a generic face, but not a specific one unless I have a model or picture. If I had to give a description of someone, even family members or close friends, I would be hopeless other than very basic things like relative height, hair and skin color.
In my experience with aphantasia, I struggle with the ability to describe people based on their physical attributes (my parents for example) but I think it's distinct from face blindness. I can easily recognize people that I know purely based on their faces, but I don't believe that people with face blindness could. I just can't visualize what they look like mentally.
It's a non-issue. I never even realized that it was a thing until I several years ago I was listening to a podcast that involved discussing mental monologues and imagery and thinking "WTF are these people talking about?!", and then doing some research. I had previously always understood things like "mind's eye" and inner voice/conscience as metaphors or some kind of mystical superstition.
Same here. I never realized until I read an article about it well in my fourties.
I read the late Wittgenstein when I was twenty, and I also thought that thing with "the meaning of a dog is a mental image of a dog" was a metaphor. He quotes this somewhere to criticize it iirc.
I don't think in words unless I'm reading or writing and "thinking "WTF are these people talking about?!"" is just a metaphor for incredulity (how else am I supposed to that feeling across the internet, through text?). I especially don't have an independent, always-on commentator talking to me in my head all the time, which is what I gather "inner monologue" is.