Welcome to the Real World!
Languages are not designed in a lab. There is no evil manager asking his team to make it more complex so that the Global Services department can make more cash with consulting. Languages are a living being, that undergo the same natural selection process as the other species. You can lament about the lack of efficiency of our senses, compared to felines, birds of prey etc, but don't worry -- if it becomes critical, we'll
naturally improve in these areas. No need for mad scientists to tamper with DNA to create improved races
FRC