Retrain your fingers! Seriously though, muscle memory is a big factor. Get out the habit of typing the next letter, if the word is there just use it. Iirc, this is how they beat speed typing records.

It's because the developers are self absorbed narcissists who think you're staring at the prediction bar while typing and so if you are still typing after it shows you that word, even one character, that must not be the one you're trying to type. What if you're using a keyboard how it's supposed to be used, as a utility to interact with something else rather than treating the keyboard as the center of the universe, and so looking at what you're typing as you're typing it, like a normal person? Guess they didn't think of that.