In the age of billionaires like Elon Musk, Larry Ellison and Jeff Bezos, and the outsize companies they lead: Market-cap weighted indexes are out of whack. Or more diplomatically, they’re highly concentrated. One theme this year has been the rise of equal-weight ETFs and similar funds that help investors diversify beyond the big names. But that hasn’t helped RIAs tracking uncapped benchmarks, as concentration limits have kept index funds from allocating more than 25% to any one security or 50% in total am ...