It isn't normal that a goalkeeper is careless when the ball is passed to him. That's nonsense. In fact the best goalkeepers out there are those who have superb ball control with their feet because they can initiate a whole new range of game situations that other teams can't when their goalkeeper isn't as good in ball control and passing. But there aren't that many goalkeepers who are made part of the dynamic game by their teams.
That is new requirement for modern goalkeeper and it must be gained through changes in football academies and how they were grown up as youth players. De Gea belong to one generation before this current generation of goalkeepers. In his generation, goalkeepers like Neur changed the definition and requirements for goalkeepers but it's too late for De Gea to change. Maybe it is not only too late for him but also he does not have good talent with his feet.
If you have a goalkeeper like this, you should not pass the ball to him too much and should avoid to do this in dangerous situation. Kicking the ball as far as possible is better choice and see how Maguire tried to dribble, pass the ball inaccurately many times. It's his weakness and at this age, it's too late to change your skills entirely.