Regarding greenhouses, any example you cite I can say is way out of economical norms ;-) But the only way to make organic work (without throwing away half the produce or drowning the field in the few allowable chemicals) is to either do it indoors or in a part of the world where the pests don't exist yet. But that is neither here nor there.

How do you get the extra robots installed on the radial systems? With gantry and wheel based systems, you plop them down at one end of the field and then they re-arrange themselves.

I was specifically thinking the advances in time-of-flight LIDAR that seem to be for short range (several feet) gesture recognition. Not for object avoidance (Deere's use case) but on the wrist of a manipulator, where you don't always have the space for a stereo-optical setup.

One day hermetic greenhouses might make sense. Until then it will be cheaper and (arguably) less impactful to grow the veg someplace with reasonable weather and pests and ship it instead.