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>> This sounds more like a religious dogma than anything else.
>
> If "ZFS volume" means "ZFS pool" here, it is also blatant bullshit.
> There are a lot of reasons for having more than one ZFS pool, the
> easiest being separating SSDs and HDDs for fast vs cheap storage.
assuming one would like to use ZFS - it is of course right. As with any 
other filesystem.

Even more - no matter what filesystem i would use i would never want to 
put tens of disks as one filesystem. for simple reason of recovery and 
reliability.

And i consider FreeBSD loader already overcomplex. having separate 
partition for boot stuff is just fine. After kernel is loaded it takes 
care of all stuff.