Follow-up Comment #9, bug #35354 (project grub):

I think you didn't understand what I was saying: GRUB uses BIOS to access
disks by default. And BIOS disk driver (known as int 13h) has no function to
get the ID.

As to the need of updating UUIDs in configs, you need it with disk ids as
well.
Also even when using disk ids btrfs uses UUID to assembly the different
members to a consistent FS. With duplicates you can end up with one original
disk being matched with a clone and so have an utter mess.

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