10% liquid doesn't necessarily concern me when considering a bank. But, they have many more routes to liquidity than FTX (Liam from the fed, loans from other banks, etc.). And even still, 10% isn't legal for a bank if their liquid assets are too volatile.
450 mil was in SBFs Robinhood investment, and FTX clearly didn't have any other avenues towards liquidity. 10% without an out was a predictably bad idea