For decades, Wall Street titans – from former Goldman Sachs chief Henry Paulson to Blackstone co-founder Stephen Schwarzman and Bridgewater founder Ray Dalio – were hailed as “old friends of China”, feted by senior officials and granted rare access to the country’s top leadership.Today, while American financiers continue to visit China and maintain commercial links, those private meetings with the top leadership have largely diminished, even as Beijing gradually opens its capital markets.The...