#2 Defensively weaker with the element of invincibility fading
Bayern Munich's previous success was built upon a solid backline in which Guardiola regularly opted between a back-three and traditional back-four. Under Ancelotti, the Bavarians have become far more vulnerable in defence with the major players losing form that was once considered 'world class'.
During the 2016/2017 season, Ancelotti's side conceded 33 goals in all competitions despite the arrival of German international Mats Hummels. On the contrary, Guardiola's final season at Bayern saw just 23 goals conceded in all competitions as they claimed a domestic double with relative ease - Boateng being a crucial component of their success.
Not only are Bayern struggling to keep clean sheets more regularly, but the team lacks the mental stability that once reigned supreme under previous regimes. Unless they can shrug off the mental issues that undoubtedly exist, and limit their defensive mistakes, European dominance will remain nothing more than a dream.