Japanese (and Chinese) features intricate ideograms with up to (I think) 22 strokes per character. It's not the language itself, so much as the fact that the display and touch-sensor resolution is good enough to be competitive with paper. Other handwriting platforms I've looked at in the past required writing on a larger-than-natural scale or comparatively slowly (often because of OCR requirements, which are not relevant here, but also because at the time display resolutions were comparatively low). What I saw in the video was natural handwriting speed and good registration with good resolution, which to me passes a threshold of usability that only paper has met up to now.
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