I just can't understand your persistence. All attempts to defend using fixed fortifications during WW2 failed. After WW2 no one built such fortifications any more. I would make a conclusion that they were bad idea. You make conclusion that they were excellent idea. We probably are thinking in very different way and therefore agreement is impossible.
Please, keep posting. I'm not going to take them seriously, at this point I'll just rub your nose in it.