One argument for why it might not make sense is that banks were actually hurt by traditional banking problems (extending credit to poor risks and run on the ban

One argument for why it might not make sense is that banks were actually hurt by traditional banking problems (extending credit to poor risks and run on the bank type issues), not traditional investment banking/brokerage/trading firm problems (large market trading losses, getting stuck with large unsold underwriting positions, being sued by investors they missold to).