Let's say I'm typing in some words after each other. The currently typed word is underlined. I decide to change something in a previously typed word, so I tap there, to place the cursor there. Now when I click the backspace button, or type something, the cursor jumps back to its previous position, and the action takes place there, at the end of the still underlined text. Not what I would except.
For the note, I turned off everything regarding word prediction, auto formatting, etc. But I still have the bar with the predicted words, and this underlining thing.
By the way I wouldn't mind using just the word prediction bar in itself, because rarely it really can predict the word that I want to type.
But other than that I don't like when something disturbs the flow of typing (like the issue I described)