Alright although Australian, i've recently completed my adult syllabus American Kenpo Black Belt after five years of twice a week trainings, now as this is the internet and anyone can easily make this stuff up I don't expect anyone to go "Woooooh", but from my perspective both sides of this argument are missing some key factors.
Rocket its unfair to say that 95% of fights are over in one or two hits, this is ridiculous, unless every single fight you have witnessed was performed by a very skilled martial artist fighting a very unskilled drunk. It comes purely down to technique, and skill. It is very easy to knock someone out with one or two punches if all three power principles are used, that being torque, back up mass and marriage of gravity.
If these three principles are used in one punch while worked from a solidified base then yes, you could easily one hit someone. But what we come back to is that very few average people if any back in the middle ages had the knowledge to implement these three power principles into their technique. So in saying that, it is ridiculous to assume that you will one hit someone in an RP fight.
Now reading Miningtilldeath's post I can see that he has experience with western fighting? Namely kick boxing and normal boxing, and I agree with what you said, but I would like to add the absolute importance of ones fighting stance. You can't have just one fighting stance, there are sooo many different stances for different ranges in referance to body mechanics. For instance in my martial art the neutral bow is the stance used between punches and while gauging and opponent, the forward bow is used when harnessing the power of torque and back up mass in the scenario of swivelling ones hips and adjusting ones outside heel thus combining the full essence of counter and direct torque.
So to sum it all up, what it comes down to are two
simple things.
1.) Skill of both opponents, being able to correctly use all three major power principles with a solidified base.
2.) Target of attack, if one were to hit the forehead one would need to hit a lot harder than the less protected throat or temple. Simple body mechanics.
P.S I mean no harshness to your guide rocket, I simply spoke from my perspective, I dont know what fights you have wtinessed but one hitting unless committed by a martial artist verse a drunk, is very rare.
P.P.S I wrote my perspective from my experience in American Kenpo, as is obvious every single martial artist will have different views and opinions, and i'm not saying what I have said is the only right way to do things, i'm sharing what transpires in my experience with my techniques, every man to his own.