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.
Yes there is no doubt that De Gea had a great time for as long as he was standing on the line and had his reflexes at play to defend the goal, but it's right that the modern game that has a lot to do with openings from the defense lines has also put more emphasis on an active goalkeeper game instead of just standing around waiting for some action. Neuer was the one who made these unforgettable moves as if he was a field player during the World Cup 2014 when they also won the title. It was some of the most impressive goalkeeper play I have ever seen.