There's a ton of good technics to dive into, but in my mind it's almost all to address one leading sore point of containers: With composefs, if two containers

There's a ton of good technics to dive into, but in my mind it's almost all to address one leading sore point of containers: With composefs, if two containers have the same file- wherever on the filesystem it is- that file will only be stored once on the host, and (equally if not more importantly) it will be shared in the page-cache (the cache for file contents). Currently, in most systems, different images end up having replicas of the same file that aren't shared on disk or in the page-cache. If, for example, your org has a handful of base images it works from, it could drastically reduce the footprint of containers, both on disk and in memory. By effectively sharing the things that can be shared.