This manga is great and all, but one thing that I don't get it is the lack of regenerative medicine in such an advanced future. It portray war injuries either as something permanent or as something that you can recover from, but at a big cost to your lifespan or power. Even with todays regenerative medicine in its infancy it was shown that it is possible to grow body tissues outside of your body and then use them to replace your damaged ones (they have done it with trachea if I am not mistaken). So, this whole limitation on the power of their medicine seems like a totally artificial restriction to have a more dramatic plot, instead of a technological impossibility.