I've put the attention of the changeset-creator to this topic. Let's se what his opinion is. In my opinion you are correct and also the street "Im Wingertsgrund" in the southern part should not be a service road but as tagged before his changes residential with the street name.
related changes is:
https://www.openstreetmap.org/changeset/83668243#map=17/50.16149/8.58505&layers=N