You can't run a harvesting tractor through a greenhouse. So, a lot of produce from greenhouses or vertical farms (etc) ends up with a manual harvesting step.
This is why you pretty much see greenhouses exclusively used for foods which would require that manual step anyways.
Note that this is an area that is rather specialized - a pepper picking robot isn't good for tomato picking or lettuce picking ( https://youtu.be/EFC3OvkVKaQ ). Compare that to the incredibly versatile human ( https://youtu.be/oxbJVqfIK1U ).
You can't run a harvesting tractor through a greenhouse. So, a lot of produce from greenhouses or vertical farms (etc) ends up with a manual harvesting step.
This is why you pretty much see greenhouses exclusively used for foods which would require that manual step anyways.