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Honestly with quadlet it might be there on the compose front: being able to deploy either as systemd-like files or as Kubernetes manifests probably solves the entire problem in a very nice way (the K8S compatibility is the real magic IMO since it's the defacto cloud ecosystem).

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I haven't played with any of Podman's Kubernetes YAML stuff yet, but we target Kubernetes.

Does it support higher-level declarations like Deployments and StatefulSets? I'm trying to understand how/if we could use this without having to write new manifests. A (very) quick search didn't clarify it for me.

Quadlets just create a systemd unit file to launch containers with podman and have systemd manage its lifetime. Since systemd lacks the ability of controllers like Deployment and StatefulSets, I doubt that quadlets are able to achieve much more.

I'm pretty sure, that cleverly combining various unit types and their capabilities/attributes would allow to cover 90% of what's needed to emulate Deployments and StatefulSets.

Yes. That's what I assume too.

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