Re: unacceptable omission
Ubuntu's linux lxd containers with "complete linux distro on btrfs or zfs" is nothing new. As with most things "new" on linux, this is another clone of Unix (Solaris and going further back, BSD) tech.
And if you care about a bit of history - LXD is also a re-work of LXC for better security which again is a linux project that started in 2006 after Solaris zones was production ready in 2005 with Solaris 10
- Solaris zones (aka containers) allows full copy of the OS to be containerized. Of course ZFS is the default filesystem on Solaris which offers "snapshotting, rapid live-migrations" etc
- Unlike LXD/LXC, you can even run different guest kernels - 'Solaris kernel zones'
- Runs on baremetal, instant boot times, granular controls over host resources etc
- Solaris and derived OSs also run Linux containers. Although Sun/Oracle dropped lxc support years ago, opensource communities (eg. illumos, SmartOS) have further developed this and run Linux containers on baremetal ( https://www.slideshare.net/bcantrill/illumos-lx )
In short, there's a lot of 'standing on the shoulders of giants' stuff behind the noise of popular new mainstream linux projects that tech-journalists often seem to have little knowledge of, and because of which this myth about linux's superiority over what came before it is perpetuated. Where in reality it's a game of catch up in many ways.