Football is and always has been a evolving game,every style has eventually been matched and surpassed.
Peps challenge is whether he can adapt his football philosophy to counter the styles that have rendered his original game obsolete.
Last season he spoke of getting the ball forward more quickly with the likes of Doku being a purchase that would enable this, unfortunately we still played a slow inching our way forward possession style and Doku's effectiveness was limited due to where he would eventually receive the ball.
On Sunday the rags had considerably more possession than we would normally allow them so players like Haaland and Doku sat much deeper contributing defensively,but it meant whenever we turned over possession both burst forward and we all saw the difference it made to their contribution.
As great as performances like the Madrid hammering were based on our possession controlled style,the level of concentration and accuracy required to pull off performances like that are almost impossible to maintain,and it's why we have been picked off so often by lesser teams.
If Pep can adapt and develop a style to win us more titles against the teams currently in the ascendency it will be his greatest achievement yet.
The main reason for our problems last season wasn't Pep's style or philosophy but a combination of factors such as injuries, including to key players, aging legends, and Foden losing form (perhaps Pep's private problems as well). Don't forget we won more points than the youngish and energetic sides of Chelsea and Newcastle. We won 3 from the 4 games against them, playing without Rodri and other important players.
Our performance vs United isn't showing a change in philosophy, but us struggling to get back to winning ways, having many new players and players returning from injuries. Pep has stated he isn't giving up on his principles. No need for a radical reinvention either. For example, having a fully fit Rodri and Foden back in form will solve many of the problems that look structural, i.e., related to Pep's philosophy.