TKD is something more people do, perceived as a "normal" activity. It'd effinately not the only martial art around. If people are serious, they learn other things as well. ie. cross training. Kungfu and muay thai are also quite big for those that are interested, as are some grappling. He, like all korean men, served in the military. He was basic infantry. The military teaches TKD primarily for it's hand to hand, with some minor variations. The one he pointed out to was kicking with the toes instead of the bottom of the foot.
Now, here's what I got out of it, and it's kind of funny looking at some of our homeland practitioners. The serious martial artists did not just learn one art, but they learned several, or rounded themselves out somehow.
This would be especially important in a martial art like TKD that focused so much in one area I think. But, are you rounded? Do you feel capable of fighting in a variety or situations? Limiting yourself to one art to stay traditional?

Adam