Arch package have node 8.5.0 and couch is 2.1.0
When I read blogs about new software and I can't just packagemanager install/update it on I don't really see any more value than living on windows installing exe's from websites.
Every distro I've used except arch has a real case of documentation not living up to what's actually happening. I've used fedora a lot and it's sometimes hard to find current version docs. But what's worse it hard to know if 2+ versions ago docs are ok because that particular bit hasn't changed.