Hi berndw!
No, I can clearly reject the vandalism accusation here. Why? Because I have done nothing wrong. All roundabouts here that are affected are "mini roundabouts" according to OSM wiki (https://wiki.openstreetmap.org/wiki/Tag:highway%3Dmini_roundabout). If there are doubts, the definitions in the wiki should be questioned and not my edits. I already made clear with the statement "Feels bad, man ..." that I also struggle with this, but according to the wiki it is correct now and was mapped wrong before. Also the creator of the note reported this for some reason. I just wanted to close the note. OSM is a project where everyone can participate, so I do not need to talk with the previous creator, but can simply implement it because in this case the matter is clearly defined and I had no open questions. If someone doesn't find my edits OK they can be reverted easily because I uploaded a separate CS for each object, so it should be easy to revert. Nevertheless, objectively everything is correct now and subjectively the "circular-mapped-roundabout", which is wrong by definition, seems to be preferred due to more detailed mapping by you?
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Additional info (attention, only conjecture:) yesterday, at the same time as these notes appeared, the user "HirschKauz" (https://www.openstreetmap.org/user/HirschKauz) mapped in the nearer region. I strongly suspect that he created these notes here because no anonymous visitor knows the difference between a normal roundabout and a mini roundabout. And if you research him, you can actually find a post in the OSM forum where he discusses exactly this topic (https://forum.openstreetmap.org/viewtopic.php?id=73394). If in doubt, ask if he was this and discuss it with him.