As you already know, the autocorrect feature on the SP is pretty weak as compared to Apple and Android. But think about it. The SP is targeted at the pure business user. Do we REALLY Want to be making those amusing and embarrassing Apple autocorrect we've all read online to our clients? The thing the SP does do very well is underline the mistakes you make and then allows you to easy fix them with a right click. More work, but for a business person probably better.