The elves do not have the desire to develop intensive planting; they simply make use of the unique environment of World Tree City to house some planting zones.
If the elves had the need, he wouldn't have to sell agricultural buildings to the Mountain People and the lords of Nanling Province. But they don't.
Moreover, security officers and patrol knights equipped with flying backpacks traverse the air, conducting a three-dimensional survey of every corner inside World Tree City. As soon as any disturbance or conflict arises, they carve nimble arcs in mid-air, promptly arriving at the concerned compartment and immediately resolving all disputes.
However, such situations are quite rare, not because the elves are morally inclined, but because everyone knows this place is World Tree City, the headquarters of the Blood of the Ten Kings. They promise people a happy life here but absolutely will not tolerate anyone (except themselves) causing unrest here.
