Some of the responses from the refs on here is why I have a problem with soccer. The rules should be enforced consistently across the board and personal opinions influencing how they are enforced should be nonexistent. Ages of the players, skill level of the players, time of game etc are not specified as reasons to tweek the rules to a particular ref's liking. If there is unlimited subs and coaches use the subbing to kill time or change a dynamic in the game then so be it. If you don't like it then petition the FIFA rule board or governing board of the league tnmt etc to have it changed. Refs should simply enforce current rules and regulations, not try to influence the way the game is played.