The job and the employee are separate things. Recent high school graduates routinely train ab initio to become flight attendants within weeks. It is not a job that requires particular skills which take many years of training or education to develop.

Flight attendants are critical to airline operations and good flight attendants possess a wide range of soft skills that would likely make them successful and valuable in many other jobs.

There's dignity in all work and all people. We would all benefit paying attention to those who champion this concept. That doesn't mean it is difficult for HR to generate acceptable candidates to be a flight attendant and to do it quickly.