Sometimes when I’m being quizzes on the reading for Kanji, I get a very frustrating error that I have it wrong, when I can’t see any difference between the correct answer and my own. I have tried using both the iOS hiragana keyboard and the built-in phonetic input in WK.
This seems to happen every time I have to write ゆ, though possibly also with よ.
I wonder if it would be worth it to automatically pop up with a link to that user guide article every once in a while when someone enters those misspellings. It seems like that would be pretty easy to detect.