I never implied the low-skilled jobs were unnecessary.
As for young people, they aren’t even the focus of this legislation. It is designed to accommodate the people who will work low-wage jobs their whole lives (since there will be many more workers than “good” jobs). In my area many low-skilled jobs are worked by middle-aged and older Americans and Hispanics; as my teens look for work they encounter these people in jobs that in my day were held by high school students.
Low wage jobs aren’t meant to be a career.