I hate it when people post things that are misinformed: you don't use horse stances or exaggerated postures during full-contact sparring. get that straight people. good tkd schools know the difference between practicing traditional TKD (the official korean martial art created by General Choi, Hong Hi) and using TKD in a fighting situation. our instructors (i take TKD) emphasize techniques that work in fighting situations when we do full-contact. if someone does something fancy, our instructors let him/her know that you wouldn't use fancy stuff in a real fight.
if you check out the encyclopedia written primarily by Gen. Choi, Hong Hi, you'd notice that there is a whole lotta stuff in TKD (kicks, punches, grappling, and ground techniques) that just isn't being taught in schools nowadays. this isn't to say that all the TKD techniques are useful. in classes that i've taken with grandmaster jae h. kim, who heads the school, he adjusts traditional techniques if he feels that they were incorrect in some ways.
that others brag about their skills indicate a failing on the part of the individual, not the MA. keep that in mind.