I had my Pixel XL next to me on my desk until it just died randomly the same way my Nexus 5x did. It won't boot at all, not even the bootloader. I also connected it to my PC and it didn't even recognize my phone. It doesn't say "HS-USB QDloader 9008" either. I think my phone is actually bricked.
Notes: Verizon Pixel XL 32 GB with unlocked bootloader.
Notes: Verizon Pixel XL 32 GB with unlocked bootloader.