[Bug 235388] gptzfsboot does not boot ZFS pool made from whole disks (regression), part two

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=235388

            Bug ID: 235388
           Summary: gptzfsboot does not boot ZFS pool made from whole
                    disks (regression), part two
           Product: Base System
           Version: CURRENT
          Hardware: amd64
                OS: Any
            Status: New
          Severity: Affects Some People
          Priority: ---
         Component: kern
          Assignee: bugs at FreeBSD.org
          Reporter: reto.haeuptli at infinox.ch

This bug report is related to bug #235380 and #220105, this is intentional and
no duplicate.

I used to boot zfs on whole disk(s) from a USB stick with a GPT partition
scheme and gptzfsboot on it since FreeBSD version 9 on many testing machines
and even production servers without any problems. With the current code base
this feature is broken. 

I found the reason in the source code: In the file /head/stand/libsa/zfs/zfs.c
the feature was disabled in the revisions base r342151 and base r342161. 

In r342151 disabled to ability to boot zfs from wholes disks. In r342161 is was
refined for the UEFI case. 

I completely disagree with the reasoning in the commit comment of base r342151
and the comment in the source code. As I said in the introduction to this
ticket I use and rely on this feature since many years.
Furthermore I do not know many systems able to boot zfs from whole disks.
FreeBSD is/was one of them. I think we should not give away this precious
feature.

I propose the following: 
 - Revert base r342151 and base r342161
 - Discuss whether the FreeBSD community should give away the feature of
booting zfs from whole disks.

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