Encryption protects your data if your phone falls into someone else's hands. The new Google Pixel and Pixel XL are encrypted by default to offer strong data protection, while maintaining a great user experience with high I/O performance and long battery life. In addition to encryption, the Pixel phones debuted running the Android Nougat release, which has even more security improvements.
This blog post covers the encryption implementation on Google Pixel devices and how it improves the user experience, performance, and security of the device.
These kinds of things should've been default a long time ago.