You also need to consider what equivalent returns would be at competing companies. Someone who joined Google or Apple in 2011 with a decade of experience could easily have made $350K in stock compensation alone, but with a higher base salary and even less risk.
Shareholders + Founders + Upper Management.
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Peons & serfs.
Much like it's always been. Peons and serfs get enough to get buy, and a little more to see them through the hard times. To make sure they keep working until they are of old age. Don't want to be adding too many to the upper middle class. They don't deserve it because they don't take the risk, you know of costing billionaires a few million... who would probably not be billionaires if not for other serfs and peons.
My point is not that founders don't deserve a pay out. My point is that if you get a huge payout, employees that made that happen deserve a good part of it. It's good for everyone involved and the economy at large. And the startup ecosystem. It keeps wealth from concentrating in a few hands who can then affect the masses adversely and the economy as well. More people with money is better than fewer people with money. Competition is what makes Capitalism work. And part of that competition comes from the fact that many people have wealth. Not just a few.
I disagree strongly about your characterization of risk. Long run losing of $10k for 10 years is nothing like losing salary completely for a year. Unless you've been very good with money, taking a year with no salary in the Bay Area means Ramen. That year is also the start-up's most risky and the one with the least support. Most of the time when I hear these arguments it's from employees who have never tried founding. People who've tried both and know how difficult it is to keep yourself going for a year making nothing and trying to convince someone to pay for what you made don't think the equity split is unfair anymore-- even when they go back to being employees.
Joining a company after C round is likely to be a solid financial decision, but not significantly life-changing. Joining a unicorn who got to that valuation by taking a few late-stage financing rounds is almost a losing bet from math standpoint - that entity has so many ratchet conditions, side letters, and so much dilution you might just as well start distributing those shares on soft paper in 24-packs.