I know that people can't really digest more than a few mail and mirror "SHOCK Fat Luke's HUGE fullback issue" headlines and a some random tweets from gormless bell-ends these days.
But I am surprised nobody has really mentioned this; When we played in pre-season he was free to run down the flank and actually used his own creativity and instincts to get up and link up well with Young. It is one of the first things I noticed in pre-season that looked odd to me. "Luke Shaw is just bombing up the field and it looks out of place..?" He kind of reminded me of Evra, when Evra would just bomb up field and then jog back (not so much the jogging back but the bombing up field).
He didn't do this at all last night. I guarantee you in between the PSG game and today Van Gaal has had a word to him "no more bombing up the line now that the season has started" he played a support role nearly identical to Darmian today where he'd centre the ball and support the midfield rather than run with the ball and use the midfield to support Young.
I really don't see a point in playing fullbacks if they aren't allowed the freedom to get forward and support the attack. He's a young lad, just tell him to use all of his energy to get back and cover. Frustrating.