I disagree: Using docker makes it incredibly easy to tinker without real consequences or hassle. Want to try out - say - Heimdall? Create a docker-compose.yml file, an nginx reverse proxy config, and spin up the container. Don't like it? Remove said files and container. Thought about using a wiki for a project? Same thing.

For me, containers are just abstractions similar to packages, or OOP objects, or even apps. And as long as a service fits into this view, I think docker provides a great way. But, sure, you can overdo it and end up with more complexity than less (e.g. Nginx Proxy Manager).