The hyperspace routes we used before Contact and in the first century after Contact where highly proprietary. Each major alliance held tight control over our systems and the runs that united them. Alpha Centauri was our largest shared system due simply to the fact that there would have been war had anyone tried to stop anyone else. The other routes were another matter, which is why many strong Alliance systems never saw a Chinese or Russian starship before The War came upon us all. And why we never saw the Chinese or Russian systems. We lived in different worlds until The War brought us all crashing back together again. It was not a happy reunion.