Earlier quoted context omitted.
I think people do it for fun. Why automate the fun work?
On a smaller scale why not. I attend the forest nearby at times, neighbors do it even more often .. but we can't ensure good care of a whole field set. Even if there were large social efforts for people to gather and maintain nature, we'd still be at the mercy of pest / insects / microscopic life acting at night.
[1] https://robomechjournal.springeropen.com/articles/10.1186/s4...