This mainstream self-actualization of work is probably an artifact of knowledge work moving from the domain of the intellectual elites towards the masses, which broadened the prospects of people beyond working on the fields or factories for a lifetime. Two generations of this during an economic boom created a recipe that was immortalized in culture, but didn't work as well this time, and the ones who were spoonfed the dogma are still reeling from the bust, while the ones who were rich enough or lucky enough have made it through fine. The angst about the lack of job-related fulfillment transcends generations, but it mixes with the realization that they likely can't leverage their job experience and relationships to advance forward. And despite all the armchair economists repeating the refrain that the economy is not zero sum, people aren't blind and know that their relative losses to their peers affect their future prospects and likely stunt them for life.
Nonetheless, we shouldn't conflate intellectual fulfillment with financial security, and their respective lack thereof. People earning well who feel professionally unfulfilled have options to find something they like more, without the crushing pressure of needing uninterrupted income. And those engaged in fulfilling work with tangible impacts can get paid peanuts; in these cases it's often their emotional attachment to their work that keeps them going. It's most unfortunate when the two conditions coincide. But it should also not come as a surprise, as there's no morality in the economic system itself; rather, all money being paid out is coming from somewhere else, because somewhere someone thinks it's where it should go. The people in bullshit jobs wish they were in control, but control is harder to come by than money. Others on a different tier of Maslow's just wish for money, and so on.