#4 Lack of focus on youth development
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Again, another oft-repeated accusation, Mourinho doesn't nurture youth players. One only needs to look at the level former Mourinho rejects De Bruyne, Lukaku and even Bonucci are at to see the truth in that accusation. While Mourinho can point to players like McTominay who has gotten a significant amount of playing time under him, they rather feel like the exceptions that prove the rule.
Even this preseason, Mourinho was reluctant to play Manchester United Academy products choosing instead to bemoan his lack of first-team players and overworking the few first-team players who did make it. He even went as far as to criticize the youth products publicly for not being at the same level as the first team regulars. This attitude could lead to talented youth players rejecting Manchester United for their development.