Personally, I like to micromap. I’ve mapped individual trees, poles, benches, and trashcans, for example. I also like to map forested/scrub areas. Buildings themselves are also kind of fun to map, so long as I have the building plugin installed to JOSM.
How long ago was this? Their deletions could be reverted. That’s not a good reason to delete someone’s contributions.
I think it was 2 years ago