Much of the attention on Goldman Sachs’s earnings on Tuesday focused on the Wall Street firm’s reorganization, which de-emphasizes traditionally profitable, if volatile, businesses like M.&A. advice and elevates steadier operations like asset and wealth management. (It also splits up Goldman’s struggling consumer-lending unit.) But yesterday’s results also highlight a split in big banks’ fortunes. Goldman and Morgan Stanley, which rely more on traditional Wall Street businesses, suffered from a slowdown in high-finance activities like deals and I.P.O.s that led to drops in revenue. By comparison, lenders like Bank of America, JPMorgan Chase and Wells Fargo that rely on Main Street for more of their business reported sales gains.