Peregrine,
I agree with most if not all of the points you make. Our differences may be largely semantic. I know the terminology...fence, interview, etc. I also know the terminology from wing chun, most FMAs, I can speak some basic Japanese, etc., but I don't use any of it unless I must. First, I think that many people, especially new-comers on a forum or website will have no idea what you're talking about if you call someone sizing you up an "interview", or a pull and punch a "lop sao da". Mostly for that reason I tend to stay away from in-group terminology whenever possible. Second, I like to keep things as simple as possible. Don't get me wrong...I'm not saying that you shouldn't be using the terms you are...just trying to make myself understood.
Regarding someone asking for the time, if an old couple asks me for the time I'd stop and tell them what time it is. I base that on the individual(s) and I strongly feel that the vast majority of people are capable of sensing who you can very safely stop for, who is questionable, and who you should certainly not stop for. When I was teaching, which I have not been doing since Katrina, I talked to all my students about these things. I don't specifically remember any of them not crossing the street if they were approached on the same side of a block by a person who likely had the potential to be aggressive. And, no one I taught would not have paid attention to a person who crossed the street directly toward them. We discussed being alert as to places where a person could hide behind, not walking close to corners or bushes, etc. BUT, to me, and what I tried to get across to my clients, is that all of this is an extension of "keep your distance". You keep your distance not only from people who could pose a threat, but also from places where people could hide, etc. As you very well know, maintaining your distance is not a magic tool. Someone can encroach on it anyway. So my simple "rule" was, if you're threatened and you cannot escape, attack. Attempt to maintain distance, and if you can't, something is very wrong.
I agree with you about distraction, deception, and perception, but still I think this can be covered by maintaining distance and being aware of your surroundings. For law enforcement I think things are a bit different. I taught a number of cops, and obviously they've got far greater needs in this area since they need to get close and stay close to potential attackers to a level much greater than non-leo's.
Anyway, I feel this is a relatively simple part of self-defense. Be aware of your surroundings, keep your distance, and attack when you feel threatened and can't escape. Spend the vast majority of your time training physical self-defense so you're ready if the above fails to keep you safe. It could be that I'm over-simplifying here, or that most of the people I taught self-defense to in New Orleans were already very aware based on the place they lived and the fact that they were coming to take self-defense classes. I have noticed that in places where there is far less crime that people do things I would consider ridiculous with respect to distance, etc.
David