You cannot structurally expect everyone to have a good career in the us. It is not currently mathematically possible. Please don't delude yourself into thinking the economy could function the same as it currently does without lifelong service industry workers
there is no reason to believe that a service worker can't have a good career.
This may not be the case now, but that can change.
I'm always wary of paraphrasing Graeber, but it's possible that living in a world where a small handful of individuals own the majority of the wealth has led to the market rewarding various jobs in a way that creates more misery than is strictly necessary - for example corporate lawyers being paid hundreds of thousands because they can help billionaires get even richer, while farmers producing the most important of all resources, food, are constantly hovering around the poverty line.
EDIT:
and as a mathematician, I would appreciate a proof of your "mathematically impossible" proposition. :)
Sorry, I think you missed my point. My point is that our economy is currently structured with so many jobs paying too little, having no benefits, no pto/healthcare, that "people should just get a better job" argument doesn't hold water numerically. I think the solution to that is to ease the wealth gap.