Why is it someone else's job to "un-bro" them? Why can't it be their job to do it for themselves, and just have them find out they're unemployable in their desi

Why is it someone else's job to "un-bro" them? Why can't it be their job to do it for themselves, and just have them find out they're unemployable in their desired job unless/until they do? Companies insist they won't hire people who'd need to learn other fundamental skills of the job (and that if you want the job, learn that stuff first), so why not this?