The most valuable asset in baseball is starting pitching and Milwaukee ain't signing the likes of Chris Sale as free agent to fill in rotation gaps. To trade away guys like Peralta and Burnes for half a season of Machado is not wise use of assets. Now if they were getting 1.5 years of Machado then maybe you do it, but for a rental that is an awfully risky move and could easily take you out of the playoffs for years to come.