Have you read any books or articles from Mr. O'Neill, Master Anslow or Master Abernethy? Have you seen any of the DVD presentations or attended a seminar that addresses what I've been discussing?
To touch on Mr. O'Neill's book, page 68 looks at the opening movement of Il Jang. From his perspective, it is an effective forearm strike to the upper torso of an attacker, followed by a balance displacement technique to off-balance the attacker and a forearm strike to the back of the attacker's head. This is not the only interpretation of this movement, I have described my own in this thread. I do not claim mine is the only or best. But I will state my opinion that it, as well as Mr. O'Neill's interpretation is a much higher % movement against a determined attacker than what is offered in the above link to the form video i.e. down block against a front kick and straight punch. That is an interpretation, I do not feel it is the best interpretation. I do not say, again, that my interpretation or Mr. O'Neill's is what the TKD pioneers had in mind. As I stated, and this isn't a shot at them, they did the best they could with the training they had at the time of the forms development. This does not negate the principles that are held within the form that can be linked to similar movements with Karate kata.
Il Jang for those not interested in SD can simply stand 'as is'. For those interested in SD, Il Jang like Pinan Shodan can contain a wealth of information. I could easil spend six months with a student on just this form and at the end they will have learned defenses from both typical arms length fighting distance and grappling distance. They would have learned CQC, balance displacement, throws, locks and numerous other principles of value to a SD practitioner. Il Jang would not be a 'beginners' form to quickly learn for the next colored belt. It would be a catalog of valuable principles, tactics and strategies upon which they can build. I agree with much of what Masters Abernethy and Anslow as well as Mr. O'Neill propose.
That is my viewpoint, that is how I teach.