What would the benefit of re-locking the bootloader be? Protection against rootkits? Once someone has physical access to your device, you can pretty much alwa

What would the benefit of re-locking the bootloader be? Protection against rootkits? Once someone has physical access to your device, you can pretty much always consider it to be compromised. Also, I'd assume that the stock recovery on most phones will check the signature of the running Android, and refuse to boot if it doesn't match the one from the manufacturer.