Of course, I understand that machines are an advance in companies, but there are some others in which the human being is necessary, even to operate such machines, as the case you express, these do the work of bottle caps, but it does not work without being operated by the human being.Yes, I believe that there are a few jobs that cannot be replaced by machine. however, some jobs in factories are indeed replaced by machines. For example, there was a time when bottle caps were manually fitted by humans but now machine do this job perfectly.