I think it's really harsh to have a go at him at this stage of his United career for that missed pass.
Playing football is often about instincts and mindsets. When Pogba gets the ball, his first instinct is to play a long ball over the top, and his mindset is to set up counters at every opportunity. That works for him as a player and for Manchester United as a whole because it plays to everybody's strengths.
Van De Beek, on the other hand, was raised in a different league and in a different team. His instincts are more about short passing, and his mindset is more about quick passing triangles. It's going to take him time to adapt to a different way of thinking.
You could see that he spotted Rashford's run, so it wasn't that he lacked the vision. He hesitated because it wasn't the kind of pass he was used to playing. A few more months at United and he'll hopefully get there. It's about making that kind of ball second nature. I don't think he's lacking in either intelligence or technical ability.