Why does zroot have a mountpoint by default?

From: Pat Maddox <pat_at_patmaddox.com>
Date: Tue, 12 Apr 2022 05:06:22 UTC
On a new FreeBSD 13 ZFS install, zroot has mountpoint=/zroot. I am 
curious why that is. Also, are there any bad consequences of setting 
mountpoint=none for it? -Pat