but someone has to do the preparation of the ingredients if the robot is unable to do it.
This is something to really consider. You are tired already and you have to prepare all the fresh veggies for the automated robot to take over.
Nevertheless, it's a kudos to them, invention is no easy task. They'll gradually build upon the tech I guess.
Indeed, but the idea is probably to set them up way before you "get tired" from work. But then, it's still work. Same thing, really. It's a great feat anyway.