I don't work for Goldman Sachs and I get lower interest loans from my brokerage account than Goldman offers. The reason his brokerage account is there is probably because Goldman requires its employees and spouses to hold their securities there, so compliance officers can check for insider trading.
That was the requirement when my hubby worked for a broker/dealer 20 years ago. Brokerage accounts had to be handled through them.
That’s wonderful ! None of it matters - we are soooo screwed.