If "you" here is one person and "your app" is one app, then yes, why do you need a container. If "you" is 200 developers, and "your app" is 75 different applications written in Java, Java plus native libs, .NET, python, the other python, R, scala, NodeJS, and various C libraries, then docker containers, and more importantly images, are about as ideal as it gets. We're running Mesos so we don't have to use docker to get containers, but packaging up the products as images is a significant advantage.