The ball moves faster than any player can
Allegri doesn't seem to understand the importance of making the ball do the work and making the opponents chase the ball around for a little while
This allows the team in possession to recover some of their breath and making the opposition do the work
The concentration levels required to defend deep in your own half are also quite high, the slightest of mistakes get punished so it's very important to focus, this mental energy will fatigue you faster where as when you're the team moving the ball around the opposition do all the running and defending which tires them out faster