Why is his opinion to be muzzled, rather than those who suggest having a career plan? How do we know a career plan is good advice for everyone?
The question is how many people the advice would be useful to vs how many it would harm, and to what degree. Framing it otherwise just inflicts a massive loss of utility on all the people who would have benefited from it - i.e. you'd be choosing a world with more misery to live in.