I can attest that flick-method typing is fantastic for Japanese. I'm over 100 WPM typing in English, so using standard romaji-phonetic input on a keyboard is st

I can attest that flick-method typing is fantastic for Japanese. I'm over 100 WPM typing in English, so using standard romaji-phonetic input on a keyboard is still the fastest for me, but flick-typing is bar-none the best option for a touch-screen. You don't even have to bother with using the modifier button (for the ゛or ゜markers) because the prediction will guess what you meant. It's much easier than even typing my native English as far as phone input goes.