Some subjects by themselves can be useless - depending on what you think is and is not useful/useless. You want other skills to be able to get a job. Physics major can study other things than just Physics. Needed is to know how to operate equipment, know how to handle devices and machines, but at least Physics can help you think about how to study and find solutions for problems or objectives.
Study and get training for more than just one major field; there are useful and related courses to make a person marketable.