I think Rabiot has the left-footed syndrome. From what I observe, most right-footed player can use their left foot to a certain useful level. But most left-footed players have very weak or awkward right foot, and that limits their effective very much. When you have super agility or pace and play higher, it is not much big problems, but for a central midfielder, it is a red because the opponent can know pretty much everything you can do.