Docker compose is just a setting file for a container. It's the same advantage you get using an ssh config file instead of typing out and specifying a user, IP, port, and private key to use each time. What's the advantage to putting all my containers into one compose file? It's not like I'm running docker commands from the terminal manually to start and stop them unless something goes wrong, I let systemd handle that. And I'd much rather the systemd be able to individually start, stop, and monitor individual containers rather than have to bring them all down if one fails.