HONG KONG Markets are welcoming Chinese tech giant Alibabas plan to split into six independent entities. The reason might seem obvious. Because smaller autonomous units appear likely to be nimbler and more adaptable, one might expect the restructuring to help to revitalize the massive company and boost productivity. One might also assume that dividing the company will alleviate the monopoly concerns that have made Alibaba a primary target of regulators in recent years. But, as compelling as this logic seems, it is deeply flawed.