> I asked you for at least a usecase when it makes a difference but till
> now I've read only about theoretical advantages.

Ok, my usecase is the following:
We are installing grub to EFI system partition and on the next load it must 
load itself (rmadisk&kernel) from Windows partiton (where our main product is 
installed). It need however to find the NTFS partition with our product, the 
only ways is GPT GUID.

Out of Linux world FS UUID is nothing, our main product works on Windows, and 
the only way to identify the partition correctly - GUID. UEFI spec also use GPT 
GUIDs in it's "device path", same as Windows.

grub2 is not for Linux load only.


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