For years, the wealth management industry has steered by a single north star: moving "upstream." The logic is simple: To boost profitability and avoid commoditization, firms must focus on the complex, lucrative market of high and ultrahigh net worth clients. Experts often argue that the largest firms — those with the means to offer one-stop shop service to their wealthiest clients — are best positioned to execute on that strategy. And at first glance, that appears to be the case. Among the industry's bi ...