>>14243026until we figure out how to make cheap, reliable, and robust digital skin. Yes, the main problem is just that you have a pretty dynamic system attempting to pick up something without any feedback.
Try sleeping on your arm and try tying your shoelace, even though you have full vision of the problem, which most robotic applications don't, it is still very difficult for us to preform this very simple task.
Outside of a few applications of picking fruits or whatever it seems way too general to use something like a soft robotic gripper. The problems that are currently soluble by soft robotics tends to be the kinds of problems that are very easily done by low-skilled labour, which allows for reduced cost.