I am one of those people that don't update unless an update offers a solution for a problem or offers a new/altered feature that I wan't. Don't fix it if it ain't broken. The ZFS Feature flags where a bit of a problem for me as I was not enable to judge if I should update or not. Now I can act informed and that is great.
Excellent - Concise/Understandable and very comprehensive for such a short article! I posted a question regarding interoperability of ZFS Linux/FreeNAS, and was having trouble understanding the answers - this made it all come together!
Apart from an earlier from posting by Ericloewe we didn't have an explanation of the disabled/enabled/active states of ZFS feature flags here in this forum, at least nothing that I'm aware of. Extra Bonus: Feature Flags introduced in 11.2.