Hi. Thanks for bringing up this issue originally. I think it has started some good discussion with the Debian zfs maintainers.
However, I think this particular subthread about zfs has served its purpose. I cannot find anything in your message that is on topic for the debian-devel mailing list. Rehashing github discussions between two non-debian parties doesn't really seem of central import to the Debian developer community. Discussing what the open zfs and kernel community should do and how they should work together is certainly off-topic for debian-devel. There are certain zfs discussions that might be on-topic for debian-devel, but this particular subthread does not appear to be one of them. Thanks, --Sam