It's not over-engineering; it's quite a lot easier to get Docker up and running and run things in it rather than dealing with init systems, package managers (and dependency conflicts), ansible, etc for every app. You get a sane, consistent, and standard interface to logging, networking, data management (volumes), declarative infrastructure, packaging, etc and Docker swarm makes it relatively simple to scale up to multiple nodes.

Nobody said anything about monitoring or restarting processes, and containers aren't vms.