It depends, how the colony grows and how it needs new room.
It it has too much room, it is difficult to defend the hive.
I realize there are many potential problems with adding supers too quickly and reasons one wants to avoid doing so. However, I'm not sure I understand how adding a Super makes the hive more difficult to defend. I thought that would be something determined exclusively, or should I say, mostly by the size of your hive entrance.
What am I missing?