Recently implemented steps by the two government-sponsored enterprises to provide an alternative to repurchase when mortgage insurance is rescinded is a pleasant salve for a minor ailment, but it does nothing to address lenders’ chronic pain of sudden and unexpected buyback demands, according to a mortgage lender. Last week, new GSE repurchase requirements took effect, including the “MI stand-in” option, which Fannie defines as “the full mortgage insurance benefit that would have been payable under the original mortgage insurance policy if the mortgage loan liquidates.” In May, both Fannie and Freddie announced...