I apologize for my discovery journey. In 2015 Lennart was quoted[1] saying that "Initially we wrote it for testing purposes, but *nowadays we consider it ready for many production uses*. In fact CoreOS' rkt container tool makes use of it as the lower level container backend."[2]
[1] https://unix.stackexchange.com/questions/180161/why-is-systemd-nspawn-not-appropriate-for-production-deployments [2] https://web.archive.org/web/20160414065508/https://coreos.com/blog/qa-with-lennart-systemd.html >
