He has a great football brain, but he's regressed in that area the more he's gotten to play as a winger. It started to happen last year under Moyes. I've said this countless times, but in the youth team whether he was a #10 or on the right wing, he always came towards the ball and had a bit of freedom. He shined. At this point everyone was pointing out how intelligent he was compared to everyone else on the pitch and he had the touch, technique, and passing to always stand out. This is why I wish there were more of his games from 2012-2013 on youtube to show how drastic his play style changed.
I don't know if he started to receive instructions from Moyes or Giggs, but he started to really emphasize dribbling under them. He always had the ability and he showed it in the youth teams, but he chose to do so a lot less. This was despite playing against smaller, weaker, and slower players in the youth teams. In the first team, he started to dribble a lot more despite playing against men. Why the sudden change? I don't know.
As the season went on, he started to come towards the ball a lot less and frequently found himself waiting for the ball to come to him on the wing. This is a completely different playing style than what he showed in the youth teams. I'm sure he was instructed to do this, because that isn't his natural playing style. That is why there were a lot of games where he was invisible towards the 2nd half of the season.
His game became all about dribbling and waiting for the ball. You can see how that's a problem this season. If his dribbling is on point, he becomes really dangerous. If his dribbling isn't working, then he becomes a one trick pony who frustrates the fans with his bad decision making. This on top of receiving the ball a lot less. This trend has continued and it's obvious that LVG likes his wingers to keep the width.
I think it's important for the coaching staff to realize what kind of player he is. As a young player he isn't going to refuse to play a position. Pereira and Januzaj have both stated that they will play whatever position the manager asks of them like all young players would say. They'll take any playing time they can get. I also understand that he has better players in front of him that can play the #10 or at least have freedom to be on the ball, so he'll have to deal with playing on the wing like a lot of young players start out. It obviously sounds silly that my post makes it sound like I know more than the coaching staff (I don't intend to come off that way), as they obviously know more from watching the players in training, but it's just frustrating seeing him play so differently than what made him originally stand out in the youth teams.