The advantage is that ephemeral containers use an overlay system, they are much lighter than conventional containers. It would be nice...
However, clone and destroy do the trick.
Why do you think an extra overlays file system is lighter than native thin clone support? I doubt this is always the case. But yes, there are differences.
Why do you think an extra overlays file system is lighter than native thin clone support? I doubt this is always the case. But yes, there are differences.