Even Pep will tell you that how you set up tactically can expose weaknesses. Vidal was selected for very specific reasons that ultimately did not work, I would've preferred to see Puig paired with De Jong and a more mobile DM anchored behind them than Busquets. But this, again, is down to poor sporting outlook
Team selections were not always clear they were coming from Setien either but ultimately he flattered to deceive despite his impressive stints with smaller clubs. I saw this even before confinement and it was obvious they would never reach maximum efficiency with the current squad. Of course, Valverde was just as poor a selection but he more clearly was a lap dog for Bartomeu
I think the areas where they have looked the weakest (wide attacking players & fullbacks) were the biggest issues, Vidal was meant to help mitigate those deficiencies but cannot cover poor sports planning. Of course, I remain a bit shocked at how poor Ter Stegen was on the ball - is that down mostly to him or a coaching staff that did not properly prepare their team, not sure. I hope the next board will course correct where needed