Best tips or realizations you get working at a brokerage?

Has anyone here ever worked for Charles Schwab, Fidelity, Chase, or a financial company where you see the customer's profiles, habits, and tendencies to buy or sell before, during or after a market crash? Have you ever gotten inspiration from their portfolio holdings and allocations? Used to work at a bank but that's a whole 'nother ball game compared to trying to fight the market as an individual investor.

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