I am also a Linux kernel contributor, so running the latest kernels is important for me. This prompted me to switch from Nvidia graphics to Intel graphics a couple of months ago. ZoL's future kernel version support should reflect this.
As for the issues you linked, the project will likely not be able to tackle them until next year, but being in the tracker means that they will receive attention.
As for cgroups blkio - there is already a bug report: https://github.com/zfsonlinux/zfs/issues/1952
Sorry. It was not my intention to suggest that ZFS does not compile on new kernel versions. I've never had problems with that. I just wanted to point out that it's not in the mainline kernel and for some people that might be important.
Thanks for your great work on ZoL! It made my life a lot easier :)