Going off the last post, I'm in kokikai style which I'm told is similar to Ki society. Practicing 3-6mths, I've never heard atemi spoken of. lol had to look it up after seeing it so much in here. However, we do focus on taking their balance and leading as tedehara said. Experiencing the effectiveness of several shodans, I'd say atemi isn't necessary either.
-Jase aka The guy who almost went through a window on day #2... lol