Google "zfs memory requirements" and pick one. Go argue with them, not with me. The top result is a Stack Overflow answer, perhaps you can start there.
That's not documentation, and the posts agree with me, counter to your original claim.
> Go argue with them, not with me. The top result is a Stack Overflow answer, perhaps you can start there.
The top result literally agrees with me. It links to a page talking about dedup.
So, Google actually proved you wrong. You're spreading FUD.