As Argentina U-21 Manager, totally agreed.
There're too many days between the deadline to confirm our list and the matchday.... some players plays custom cup, league match and WCC match in the middle, too many chances to have a list reduced in strenght.
If no possible, at least, deadline to confirm matches should be changed a couple hours later..... custom cup matches ends about 14.00 (server time), exactly when list must be confirmed, we can't do changes if a player is injured there.....