i don't get the problem with having a narrow defense. it's a very common and sensible approach to defending. one of the most basic rules of football is, keep it tight while defending and spread out when attacking. by playing narrow the space between right back and centre back is lessened/closed and so there is no space to run/dribble or play a pass to in front of the goal. what our defenders make out of that is a totally other story though
I like a narrow defence, for just the reasons you mention.
However, Juve are taking it to the extreme and it makes them very vulnerable to crosses.
There is a balance to be struck, and Juve are not getting it right just now.
Keeping it narrow might lead to a chaotic defence, gets crowded and some work just won't get done, a lot of disorganization. Communication in our defence isn't the best.
Too many people in a small area can result in no one player taking responsibility, with all of them expecting someone else to take action.
But you can't play any system with our fullbacks, that's the problem. They're the worst athletically in Serie A. Narrow or wide doesn't matter, eventually they have to run and cover, and they just can't do those things.
Juve's system has the effect of protecting the CBs, not the fullbacks, though.
This very narrow system is having the effect of making the fullbacks do more work than necessary.
The fullbacks are getting into CB positions (where they are also not any good), with the CBs getting dragged too far to the near post, and it has the result of lots of goals being conceded because the CBs don't have a chance to intervene.
I believe Juve would get on better, in general, if they played in a more orthodox defensive manner; keep the fullbacks in wide areas where they can do less damage and keep the CBs in the centre, where they can stick to doing what they are good at.