But why did they use USB-C?
The charging port has been the biggest disappointment on the 5x for me. No video out on USB-C, whereas previous Nexus devices could use MHL or SlimPort via Micro USB. The only benefit is the reversible plug, and the USB-C fast charging doesn't seem to charge any faster than older devices equipped with QuickCharge 2.0. Lack of Qi charging was also disappointing.
I think 2015's Nexus phones marked the beginning of the end for innovation among Google's flagship line.