That's a facile argument - Mainoo, Greenwood, and Rashford are all England internationals. Greenwood, were it not for his being a despicable pos, would be playing for us regularly. Rashford just signed for Barcelona, made over 250 first team appearances for United and wasn't too far off 100 goals. McTominay just won the scudetto and player of the season in Serie A, and before that played well over 150 times for United. They're all success stories (Greenwood apart, and that has nothing to do with his footballing ability).