Why would you ever implement a feature like this?

The few hours I suffered through using Office 2013, I wondered why my typing was sometimes 2-3 words ahead of what appeared on screen. Now I know.

What a bunch of complete morons must have designed this. It made me feel like my computer was from 1993, when computers were so much slower that typing could not keep up.

Again, why, why would you ever do that? What the hell is with all the user-hostile design lately?