Frim what I've seen of the Aus U23s coning through, with the technical qualities of attacking midfielders Jake Hollman, Valadon, Segecic, the even younger Rhys Youlley, Kegan Jelacic (who have I missed?), I'm not particularly worried about Robertson. Although in the very limited minutes I've seen him for the Socceroos, Robertson looked to be a class player.
I'm already seeing a generation of players with better technical qualities than any previous Aussies ( Arnie said this too). In terms of first touch, handling speed, running with the ball and dribbling with the head up, ability to play rapidfire passing and moving sequences in tight spaces, these young attacking midfielders have the goods.
As a DM, I've liked the look of Nieuwenhof for the Young Socceroos too.