"Eyes" - An Impediment to better Structure of organisms ?

Today I had been wondering about how well formed is human species, which we regard as the highest form of organism known to prevail on earth (ya, call it modesty!!).
But the location of brain in humans is assailable. The topmost exposed location of the brain has made it vulnerable to incognizant dangers lurking at us. Another weak link or chain to human safety is its neck. The brain has been provided with some protection by encompassing it in the skull, but alas, the neck can be broken like a twig!! Once the neck, the channel of food, air, information to and fro from the brain and the rest of the body is severed, we are crippled and many a times dead.
This had set me to think, why so? Why are we structured with so many vulnerabilities? Why has nature developed us this way? This brings into discussion the topic of evolution. I believe organisms have been developed and then tested by evolution. So if we look at most of the mammals, the higher form of organisms, they all are similar in structure in terms of location of brain and neck.
The sensory organ “eye” has to be located close to the brain. The eye being a very complex sensor requires complex system of optic nerves, which need to relay the prodigious amount of signals to the brain within an infinitesimal amount of time. The process still takes 1/7^th of a second to complete!! So eye and brain are clamped together for obvious reason, proximity.
But eye is a view to the world. So it has to be in a position, which can give access to maximum span of the world around us. Also the position has to be flexible enough for it to look around as quickly as possible. The blob called head gives us the span and the neck provides us with the flexibility. So the present position is most viable but of course has its own disadvantages. But eye being a strong weapon for the survival of organism, it overwhelmingly overpowers the disadvantage.
So we are a compromise of poor nature.
A better composition of organism is being built by nature somewhere!!
( Need to destroy other organism before they develop!! :))