"frustrate those looking for cutting edge enhancements" is exactly who?
I doubt many want yet-more pointless GUI dicking around, or Firefox moving its drinks cabinet 6 inches closer to Chrome in removing useful features. Most folk like stability, and like the look and feel to stay the same unless they deliberately change it.
For me having ZFS is a major useful step in it provides both data checksums and file system snapshots. Though it remains to be seen if this is well-used (e.g. can you snapshot the OS partition/share before any update/upgrade to allow roll-back without also rolling back your own data? Is that the default option in the upgrade manager?)
systemd is another sore point. If you read Pottering's blogs it all sounds a good idea, and many aspects are. But the endlessly growing interdependency with it is a very bad thing, as its their borging of things that an init process has no need for (e.g. NTP) presumably because they were bored and did not want to fix bugs or, more importantly, user complaints instead.