I have used Korean terminology since I began practicing at Korean Martial arts. At the time, the sign on the door read, 'Karate/Kendo' but all Korean terms were used. I grew accustomed to using them mainly because it is what everyone else was using. Now I'm just used to it.
I will agree with Youngman that if one is practicing a Korean art that Korean terms are appropriate. While taekwondo has Japanese karate in its background, taekwondo
is distinctly Korean, and it is more
authentic to use Korean terms. This has no bearing on the effectiveness of the teaching.
I disagree regarding the comment,
I don't buy this "well Taekwondo originally came from karate, therefore it's okay to use Japanese terms." That's malarkey.
Many taekwondo schools are run by westerners and read karate on the marquee. As has been pointed out, use of Japanese terminology in taekwondo was initiated by Koreans coming to the states to start a business, not by Japanocentric westerners.
If the Kukkiwon
really wants to differentiate Taekwondo from Japanese Karate systems, they should put their money where their mouth is and get rid of the very Japanese belt system.
Until they do
that, they should ditch the lame attempts at coopting the Hwarang and claiming that TKD is four thousand years old. Now
that's malarkey.
Daniel