It has gotten a bit better lately, but it's still a pain.
Just recently the docker-compose stack from the current main branch would not start properly, because someone committed a faulty health check. Why does this make it to the main branch, does nobody there review PR?
Starting a new stack is nothing compared to maintaining it. Upgrading to newer images requires carefully checking which environment variables suddenly appeared in new versions or maybe were renamed. Upgrades never really went absolutely smooth for me in the past.
When you use their SaaS offering, it's a good product. Self hosted is a different story. Massive stack that reinvents the wheel for every component, lack of documentation, breaking changes between versions all the time (although this has gotten better lately).
It feels like it's Open Source mainly for the sake of good PR, not to be actually useful.
The name is ironic, as there is a german TV show called Fernsehgarten (basically television garden). It's broadcasted live every sunday morning during summer season on ZDF, basically it's a outdoor studio with music and other things around a topic every week.
Mostly targeted to elderly people, but funny to watch every once in a while. You can even go there in person for quite cheap