The goal of European unification can only be achieved if everyone participates, perhaps with exceptions in some areas. Not all countries are part of monetary union, and not all are in the Schengen area. But the fundamental goal should be to keep everyone on board.
Small players learn to be intuitive, to anticipate, to protect the ball. A guy who weighs 90 kilos doesn't move like one who weighs 60. In the playground I always played against much bigger kids and I always wanted the ball. Without it, I feel lost.