Microsoft's Word Flow a surprisingly solid iOS keyboard — with one caveat

Microsoft just made Apple's iPhone easier to use.
Yes, you read that correctly. In the past, Microsoft, for those with long memories, was rarely inclined to help make Apple products shine. However, the desktop software wars are passé in this mobile-first era. Microsoft's free Word Flow app for iPhone is a keyboard from Microsoft Garage, the company's experimental apps division, that greatly improves the iPhone typing experience.
Word Flow has been available for Windows phones, but i