Why? So we can flash any carrier Roms to our device.
Why not? Because you can dick stuff up while in fastboot and recovery.
Why did i do it? Because I'm S-Off and I like Options. (Thanks Firewaterdevs) & (Jcase)
As soon as i was S-Off I did this and it worked great,
sudo fastboot oem writecid 11111111
If you have it installed the traditional way leave sudo in or out it wont hurt either way.
If you wanna go back to original then
sudo fastboot oem writecid VZW__001
(bootloader) Start Verify: 0 (bootloader) Input CID is super CID (bootloader) Start Verify: 0 OKAY [ 0.029s] finished. total time: 0.029s