From a realistic standpoint it would NOT be an advantage to have this open spot along the wall because you would have to use men and resources to defend it when you could use those men and resources somewhere else. YES it IS advantageous for a defender to defend a point that causes the attacker to enter single file and is covered well from ranged attack, but in a siege situation (where a wall is meant to keep people out) this is a fail anyway you look at it.
So no even realistically it is a fail.