Agreed that status is part of the explanation, and the recent devaluing of parenting effort vs. job effort is certainly contributory.

I'm not sure how to weigh your statement that jobs are now "easy and pleasant" (certainly they're physically less demanding and safer than in the past) with the prevalence of chronic stress and so on. Certainly your millionaire example is weak evidence that jobs are some combination of fun and statusful, though it has the same status-quo caveats as people thinking of the upside of death. Also note the great stress and unhappiness coming from being laid off or otherwise unemployed, even among well-off people with adequate savings.

But notice also that past aristocrats were able to amuse themselves perfectly well without what we now recognize as a job, with some combination of socializing and deep immersion in hobbies. We have many people now with similar levels of wealth, yet they don't tend to evolve in that direction. Status, rather than fun, seems to be the more important factor here.

Another thought is that perhaps work has become more gameified than in the past through the same evolutionary pattern that produces superstimulus foods. This is much more possible in office work than in for example agriculture where the pattern of tasks is set by uncaring nature at a very deep level.