But the thing is that as a developer, it doesn't matter what you start with - you have both and you're using compose files, etc. So Docker is trying to make the orchestrator less relevant now, and says that 'don't worry about the orchestrator'. You, as a developer, are using Docker and Compose. (Or at least that's what Docker is trying to do here, I think.)

I don't think having support for multiple orchestrators is valuable except as a transitional thing. In this case, presumably, transitioning from Swarm to K8S. Nobody is gonna want the hassle of supporting both outside a transition.

It's extremely valuable for large IT organizations. Most of them have at least one deployment of each orchestrator, because of the proliferation of container projects in their various teams. They are very eager to adopt a single platform to manage it all. Now Docker EE can be that platform.

In general enterprises don't like to be told "throw away your existing system to adopt my platform".