NEW YORK/LONDON (Reuters) – When the U.S. Federal Reserve’s newest policymaker Neel Kashkari dropped a bombshell with a call to break up big banks on Tuesday, it was met with a predictably indignant response from their lobbyists. One described his comments as “blind.” But while no one in the executive suites of major global banks would want authorities to force them to split up or downsize, many top bankers acknowledge that their institutions might be better off smaller and simpler. In interviews with Reuters, six senior bankers said they are struggling with the costs and restrictions they face as a result of new regulations, as well as a weak global economy and troubled financial markets.