This may have been mentioned before, but I was just thinking about this perspective. When you have a deep team you:
1. Never have enough minutes for all your guys.
2. Often the money/talent is spread over many players. Not lots of guys that are AllStars, just a bunch of good guys and maybe one star.
3. The lack of minutes for some guys creates a lack of harmony.
I know some finals teams claim to be deep, but there are teams that have won it all that don't go deep at all. Detroit seemed to have a pretty tight rotation as I recall, but that may have changed.