Japanese pitch accent actually varies across regions. Some have no pitch accent at all! I think this shows that it's not very important unless you want to sound like a native speaker. I never bothered to learn the "standard" pitch accents but I tend to imitate the Kansai pitch accent of my wife :)
Native Kyushu conversations are literally unintelligible to me as a Japanese speaker. There are actually numerous Japanese dialects and accents that aren't so mutually intelligible, though of course post-TV generations understand TV Japanese.
That's kind of a secret to how CJK languages are each supposedly being a unique linguistic isolates: the rest of the families are hiding in the "dialects".
