Current status of ZFS AMIs on EC2?

From: Pat Maddox <pat_at_patmaddox.com>
Date: Thu, 23 Sep 2021 08:49:42 UTC
Hi there, I came across Colin’s 2019 post announcing ZFS AMIs for EC2 
[1]. I haven’t seen any more recent information regarding ZFS on EC2. 
I’ve launched one instance, and it appears to work fine from initial 
tests (including recovering a known working boot env using beadm).

I have also installed the official 12 and 13 releases, and see that they 
are UFS.

I have two questions:

1. Is anyone using the ZFS AMIs for production?
2. Why has ZFS not been incorporated into the official releases?

Thanks,
Pat

[1] 
https://lists.freebsd.org/pipermail/freebsd-cloud/2019-February/000200.html