Well, it doesn't bother me. Darth Simon, DSII was attacked before it was completed not after, maybe when completed DSII would not have had the weak spot that DSI had. I
think the corridors or openings, I believe once the DSII was completed these would have be eliminated. Also remember to make up for this weakness, the empire had a shield
protecting it. One last question, what is more vulnerable DSI which only took a squadron of X-Wings to bring down, or DSII which took the whole rebel fleet?, and which attack
caused more rebel deaths?