Would Nietzsche's writings and philosophy have been any different if he hadn't been such a recluse socially? It is worth noting that his environment and his own personal limitations could have influenced what he believed, as it does for many of us. Does this diminish the importance of Nietzsche's philosophy? Of anyone's? But then what becomes of philosophy if it is subject to personal experience in this way?
[Very lightly edited to enhance readability -TT]