Is that really true though?
Otamendi plays for City, Fazio for Roma, Garay for Valencia, Rojo for United, Mercado and Pizarro for Sevilla, Paredes for Zenit(and before at Roma, and every big italian club wants him), Biglia for Milan, Banega for Sevilla, Lo Celso for PSG....
The only real hole they have is at fullback, but with the sheer amount of attacking talent they have, they should be able to compensate for it, at least in part.
The plain truth is that they should not be this bad. They're massively underperforming their individual talent and ability
Messi was good until Croatia's goal. Then he turned to shite
All of these have a very low floor and they all have reputations bigger than their actual performances, none of them have played at a high level on a consistent basis and they all add absolutely terrible seasons in their careers at the exception of Lo Celso who is still young. Their players are incredibly overrated.