Wouldn't it only be required if you wanted to mount the UEFI system partition? (Which is formatted in a variant of the FAT FS, IIRC.) If you don't want to mount the system partition, you shouldn't need the module. (Although, my system puts kernel images there. IDK if this is typical of UEFI systems. IIRC, Grub is capable of loading from ext FSs, so this shouldn't be a hard-and-fast requirement.)
Well, even if kernel images didn't go there, you would still need to access it for grub updates. So it might not be a good recommendation for everyday users.
