So instead of setting everything up, only to have it all wiped later, I just go ahead and unlock the bootloader. The very first time you unlock your bootloader, it will do a factory reset on the Nexus 6P. I do this because I know that I’m going to want to gain root access to it, I’m going to want to install a custom recovery on it and I’m going to want to do other modifications that require an unlocked bootloader.
I received my Nexus 6P this week and the very first thing I did was unlock the bootloader.