There are partial implementations because some of the things in the existing spec are just not a good match for ECS or Kubernetes, for example. The aim is to fix those things in the spec. There are conformance tests so we can hopefully start checking implementations soon.
Yay for conformance tests! What's the strategy for handling things that don't make sense for other platforms? Do you expect that they'll be removed from the spec eventually, or fit in as some kind of platform-specific extension mechanism?
We are expecting to have to have some platform specific extension mechanism for some things eventually, but yes I think some things can be removed too.
