I had a number of great conversations on @cnab_spec while at #KubeCon. On the flight home I've written up what it's all about https://www.morethanseven.net/2018/12/15/what-is-cnab/ …
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Doesn't seem especially cloud native. (1) Imperative. (2) Obscures but doesn't abstract the deployment environment. (3) Ditto for the deployment tools, which all have very different upgrade behaviors. (4) Lacks observability. (5) Not GitOps friendly.
I do understand the goal of deployment tool interoperability, though. CI tools/systems have a similar challenge. For instance, Jenkins plugins are coupled to Jenkins.