maybe this new fluid line up system has more freedom to orders the player move either forward backward left or right,
rather than old arrow method only up/down. but the weakness on this new fluid system is the opponent already know which direction our player tend to play and it not a secret anymore.
i think it is better if the opponent only can see our basic formation without specific orders player position before the live match start,
the opponent only can see our fluid line up during the live match because only during the match we can observe how and where the player mostly play, so from there we know the opponent fluid line up