The nomad[0] team was just discussing today how much effort to put into our rkt support[1] (our support for rkt lags behind our docker support).
So far we don't see a lot of evidence of our users taking rkt into production over Docker, but I'm very curious if there's a significant number of users like Julia looking to avoid running docker in production.
From a nomad developer standpoint, while building long command strings is a bit awkward compared to calling docker's API, it's quite easy to support new features and manually run generated commands to test our driver's behavior.