I can agree that work isn't supposed to be fun (it's orthogonal really) and if it is fun one should be thankful. But the earliest forms of work mankind engaged

I can agree that work isn't supposed to be fun (it's orthogonal really) and if it is fun one should be thankful. But the earliest forms of work mankind engaged in was as meaningful as it gets. It was work done to survive. It's no surprise that work you can't derive meaning from is so emotionally problematic when we evolved in an environment where survival was a day-to-day battle. I wouldn't be surprised if the lack of fulfillment that motivates the wealthy to engage in all kinds of good, bad and weird behavior is driven by the same innate need for one's work to have meaning.