If you imagine a fir tree, you can see how the individual branches with their twigs and needles overlap each other from the top, creating a kind of roof which, despite the small width of the needles, provides a certain amount of protection from the rain for everything underneath. This principle also applies to some extent to targets: they are not built seamlessly against each other, but partially overlap so that the falling rain runs off over them without the need for a binding agent to create a seal. You could say that this is unnecessarily redundant, but if the bricks or pine needles were minimised, there would only be one place where damage would lead to a leak. This means that a brick point can break or a few needles can be missing - the remaining ones compensate for this and maintain the protection. Optimisation in life is not always everything, and while economy has its place, so does redundancy for protection and resilience.
I wish you an extraordinary day!