Hey, thanks! I did not get around to replying to you in my changeset.
The initial motivation for me was to have more detail, as I did not consider these as "woods" per se, but I can see the other side of the argument too. ("tree-covered area", display of trees depending on zoom level...).

wrt. the tree rows/trees non-redundancy: I actually did some work around Teatri väljak some time ago where I kinda did the same thing, i.e. replacing the treerows with trees only. I'll try to undelete the corresponding treerows sometime next week, as I was actually not aware of this semantic.

Cheers!