Why don’t analysts sue their banks for poor working conditions?

Based on what legal doctrine/law? That "they made me work hard?" If you don't like the job or how you're being treated, you're free to quit. 

Because they’re not stupid?

Emotional distress

blacklisting

you're an at-will employee and can leave whenever you want. also you're 23 and making well into the six figures, there's a catch somewhere

that said after years in the industry I'm surprised there hasn't been at least a handful of harassment, discrimination, retaliation etc lawsuits. This line of work attracts some truly awful personalities

Ur funny

Interesting question. There has to be a violation of the law, and there has to be a plaintiff willing to pursue legal remedies. The legal basis could be OSHA's mental health (anxiety, depression, etc.) recording criteria, or whatever else the attorney deems as valid grounds.

https://www.osha.gov/node/999877918

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You in fact reneged some of your work rights at the very moment you sign their contracts, they are very well drafted