Like Kubernetes?
Slightly trailing off from your focus, but hopefully within the same sentiment (that k8s was good, albeit an exception)
I would place Google ADK in alignment with Kubernetes more than this project, for the well designed abstractions, the controlplane, and handling the boring parts that every alternative will at maturity.
I can see the agent framework ignorance to the container analogy about what's running inside. ADK lacks the ability to run any agent tool, but you can build most of this projects controlplane on top of it with minimal effort, most of the bookkeeping is there already. It's more about what experience you want to have.
Yes, and unironically.
I think most of the legacy companies that can benefit from Kubernetes don't use it, while most of the companies that are using it are startups doing it for the résumé.