does the breadth subjects actually help in ANY way?
Very subjective question, different people will reap the benefits of units outside their main discipline in different ways depending on their goals and aptitudes.
The benefits can be substantial, but at the same time not necessarily directly related to jobs/money.
Several of my peers in grad medicine and dentistry said breadth units in humanities disciplines improved their academic writing, general prose and SII GAMSAT performance. I also met people who have changed their career aspirations completely because they discovered they were more interested in the breadth unit discipline.
The idea of breadth is largely informed by the United State's undergrad system where degrees tend to be markedly more generalist, even in science-heavy pre-med programs.
The
actual benefits of forcing people to do units outside their degree discipline as a matter of course is, in my opinion, questionable but probably positive overall.