Hagakure
Blue Belt
I didn't go all the way back to your original post, but I wanted to say that the few MMA fighters I know, and pretty much every Muy Thai guy I know does condition their whole shin for contact. In a street situation the person will be shocked or give at least some hesitation in most situations from a shin attack, but if you are training for that and expect pain then the advantage will be little to none. I myself after playing {gasp} soccer (yes, in America ) for over 20 years have very little in the way of nerves left in my shins, and I can say that when I've trained leg kicks the impact on me is much different than most people I've trained with.
I think the key is the difference between self defense and fighting a trained prize fighter.
I reckon that's the key difference in all of this in some regards. I train to beat the average guy on the street (whatever that is), which I'm guessing/hoping isn't a trained prize fighter. Call it limited, it's what I train for. The idiot in a club, the malcontent on the street, not a 200 pound oiled and bronzed punching and grappling machine. Tez, thought you'd like that.