I knew you would say that. The problem with this concept is that you are suggesting to lose less due to the excessively frequent knockdowns but to lose more due to the loss of defense that Armoured Fortress provides. I get it, it's a trade, but not a good one. You can build a strategy around getting hit less often or around reducing the fighting efficiency and exhausting the opponent but you can't really plan around getting eventually knocked down.

But OK, let's see how it works first. What are the chances to be replaced if it turns to be less-than-good?