As an ops guy, I would also mention the benefits of the Dockerfile and docker-compose.yml, which could be clear sources for information to how the system is built, and which in most circumstances would build the same system in dev as in prod. By changing a docker tag in the configuration management, I can roll out a new version quite conveniently to staging and eventually to production.

The potential minimalism of a container is also an important concept to mention, with fast startup-times and less services that could potentially be vulnerable.