I guess there is also a slightl performance improvement, if you have some data only containers, because Docker Compose doesn't have to start the data only containers. The command docker-compose ps won't have extra dead entries, and docker volume ls will have more descriptive output, because volumes have names.
With this, you don't need data only containers anymore. The latter one creates a default volume with the prefix of the name of the project. You can create new volumes with docker volume create my-volume or you can use Docker Compose too. One really interesting point is to use named volumes. This blog post covers a typical web server stack with nginx, PHP-FPM and MariaDB with the new Docker Compose configuration format. The Docker compose config file must start with an entry version: "2" to use the new features. A new docker-compose.yml format was introduced. This means you have more control and you can use individual services in one or more networks.
In Docker Compose 1.6 or higher Networks and Volumes are now first class citizens.
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