Comment 7 for bug 1023064

You can do this with grub for bios systems since btrfs leaves 64k unused at the start of the disk for a boot loader ( though it does not require an @boot subvol ), but this is not possible for efi systems since efi requires a gpt partition table with an efi system partition containing valid efi files in a fat filesystem to boot.

Since there is no gain to this configuration, but several drawbacks, I do not believe it is one we will be switching to by default.

In any case, this has nothing to do with this bug report, which the original reporter asked to be closed.