In the Middle Ages, all (accessible) German forests were harvested until not much was left. Most still existing forests have been re-planted and managed to produce wood since then.

There are exceptions in the form of nature preserves like Naturpark Pfälzerwald.

By the way, there are some fun docmentaries about the hard work in forestry a couple of decades or even more than a hundred years ago. This is one, the rest should show up in suggestions. https://www.youtube.com/watch?v=aeU5u4VGkrI