How can you claim it's worse, if you don't speak any of these languages? My understanding is that Japanese is usually typed with an IME, and not a kana keyboar

How can you claim it's worse, if you don't speak any of these languages? My understanding is that Japanese is usually typed with an IME, and not a kana keyboard. I press exactly the same keys on my keyboard to get "taiko" or "太鼓" -- and I find Dvorak easier. (Japanese is even better about alternating vowels and consonants than English!) Kotoeri supports Dvorak just fine, and I assume other IMEs do, too.