Every one of these articles gets the pitch of these toilets completely wrong - for every person, and in every scenario, these are not universally better. Consider the following experiment: Smear some mud on your arm. Now, using a jet stream the power of a squirt gun and very low precision, wash it all off in 10 seconds. Not so easy. Then - imagine if you put mud on a place with hair! Not only will it not be clean wit…
Sounds like you just answered the question of why these are popular in Japan but not in America.
Doesn't explain their popularity in Europe, though.