Containers, Volume Groups, and Volumes are all part of APFS's hierarchy of virtual structures and are free to expand or shrink to fill the immediate data storage needs.
I know about APFS containers and volumes, and actually you misspoke in this particular instance, because a container's size is fixed, same as that of an HFS+ partition; it's only volumes that may expand and contract as needed.
I was thinking that you made use of both multiple containers and multiple volumes in your scheme of things, but I've now looked back and realized that you said you were still anti-partition and I forgot.
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