I had to read the post twice before I really got what she was saying. I think the distinction I would make is that while there are many more use cases that you can apply to Containers that may not apply to Jails, Zones, or VMs the most common use case of "run an app inside a pre-built environment" applies to all of them. Since I believe most users (or potential users) of Containers are only looking at that use case, it's harder to see the differences between the different technologies.
My only hope is that anyone in a position of making a decision on which technology to use can at least explain at a high level the difference between a Container and a VM.
My only hope is that anyone in a position of making a decision on which technology to use can at least explain at a high level the difference between a Container and a VM.