In essence, rolling substitution is in effect at the high levels as extra time is tracked by the fourth referee for substitutions, injuries and score celebrations.
The offside rule has been amended by FIFA a couple times over the past 25 years in an attempt to increase scoring. IMHO, what you are witnessing the tournament is the development of national football programs around the globe so there is no longer a huge gap between the elite country programs and others. The athleticism and understanding of how to play the game at a high level is amazing.
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