It is amazing that the whole picture of combat is much simpler than its components! When you need to have a training plan to respond to any possibility of hand-to-hand combat, you must not neglect any aspect of it. In addition you must prioritize your tactical approach under the constraints of human limits. However, rather than attempt to create a super human athlete and work on conditioning and strengthening his fitness, you would treat Krav Maga as an add on training purely for self defense!
How do you simplify many martial arts and theoretically all the martial arts that ever existed and those that have not been created as of yet and teach the essence of them geared to hand to hand combat in a 30 hour curriculum of which five hours are dedicated for warm up?
Resorting to the scientific approach is the modern way of trial and error by actually using other people's experience to draw conclusion. But in fact you need to have vision to see what most men do not see and trust your judgment that these patterns are indeed consistent.
Imagine you getting little uncomfortable as you see someone possibly trying to intimidate you, trick you into a fight where he would humiliate you for whatever purpose he plans for...
So whats the essence? Well what is simplified version of H2H? Keeping your attacker under control!
When can I "arrest" my opponent? When he steps into your immediate territory or personal space. What is my personal space in that case? Little bit a distance greater than where he could lunge from with a fast kick, punch stab, slash jab.
That simplicity is being hammered in details from many different angles and deliberated to the point you are not only sure that it works but it also works!
Analyzing the human physical ability to reach one another's pressure points, apply momentum of mass and speed to crush them, tear them, poke them or constrict them, analyzing the immediate debilitating effect, and always looking for what has greater potential to reach first and control first makes it not only easier to master, but gives you better rates of success. Learning how to deliver most efficient and effective impact, push and pull, defection, escapes, leverages, and being aware to the reaction time concept, the chain of defense(what danger human pose at each range as you close the gap)and the effect of destructive force manipulating pressure points gives you the edge!