Some peeves of mine reading through this thread.
1) Failure to define terms: Much like the dreaded "streetfighter" label, what do you (general usage, not specific person/s) mean by "situational awareness"? It is a nebulous concept that includes too many things to list often times and would be better served by breaking it down to what is actually meant. For example, "environmental awareness" part of the situation, but we are defining now specifically where the conflict will take place, crowded bar or open parking lot, etc. It's part of the "situation", but is more specific as to what is needed.
2) Concepts that don't work for an "average person" in a real situation but are taught as if they should be. In this case, the use of "peripheral vision". Many dojos/schools teach how to use this almost magical 180 degrees of vision that we all have at our disposal in stress free to moderately stressful situations. Problem is we have two different types of vision. Peripheral and Fovial. When adrenaline hits and effects the body, peripheral shuts down and we are only left with fovial, or direct focus vision. Most often this is what is called "tunnel vision". So unless, you are able to spend LOTS of hours in high stress innoculation scenarios, the average person is better off to learn how to scan and look for threats. If you have any type of firearm training, you will see that they train officers to step off the line and move their whole body around to scan for other threats. This recognizes that a quick look or peak using peripheral vision is not going to work and you have to look at what you want to see.