This is very wasteful. On servers in the cloud that may be a reasonable approach, but there are still devices that are memory, storage, and/or network constrained enough where it's not. It's still necessary to have relatively stable interfaces such that most things can share the same version of a dependency and their still exists the ability to deduplicate the dependencies between different programs. I do agree that the current OS approaches to handle this are not great and there is room for new models, but docker containers are not a holistic solution.